Fifth module for GNED 1201 (Aesthetic Experience and Ideas). This one covers the art and culture of first the Hellenistic world, then that of Republican and Imperial Rome. Presentation focuses on the Second Century Crisis and cultural and aesthetic responses to it.
This course is a required general education course for all first-year students at Mount Royal University in Calgary, Canada. My version of the course is structured as a kind of Art History and Culture course. Some of the content overlaps with my other Gen Ed course.
2. Weakened by the enlarged scope and scale of warfare
during and immediately after the Peloponnesian War,
the independence of the Greek polis was ended forever
with the rise of Macedon and the united Greeks defeat
by Philip II and his son Alexander the Great in 338 BCE.
6. Comparison of classic-era Greek hoplite versus
Macedonian phalangite with sarissa (over 6m/19ft).
http://myweb.unomaha.edu/~mreames/Alexander/sarissa_jones.html
7. Macedonian phalanx required level ground
but was very effective.
The Roman general Aemilius Paulus wrote that when
he first saw the phalanx, it was the most terrifying
thing he had ever seen.
Comparison to Greek Hoplites
8. Alexander’s conquests spread Greek culture throughout
the near eastern world.
After his death, the so-called Successor kingdoms were
ruled by his generals.
This time period generally referred to as the
Hellenistic Age.
9. Shown here are the great library
and lighthouse at Alexandria (near
modern day Cairo).
Alexandria eventually became
antiquity’s academic center,
attracting Greek, Egyptian, Persian,
Jewish, and Roman scholars.
10. The library of Alexandria
was but one part of
the Museum of Alexandria.
Museum = study of the
muses
It functioned as a sort of
research institute.
addition to the library,
In
the Museum included rooms
for the study of astronomy,
anatomy, and even a zoo of
exotic animals.
“Starting as early as 300 BCE, the Ptolomaic kings who ruled Alexandria
had the inspired idea of luring leading scholars, scientists, and poets to
their city by offering them life appointments at the Museum, with
handsome salaries, tax exemptions, free food and lodging, and the
almost limitless resources of the library.”
11. Some of the scholars at Alexandria included:
Euclid
invented geometry
Archimedes
calculated pi, discovered hydraulic technology
Eratosthenes
calculated earth’s circumference to within 1% accuracy
Galen
systematized anatomy and pharmacology
12. At its peak, the Library of
Alexandria may have had
over a half a million items
in its collection.
In 391 CE (700 years after its
creation), the Musuem at
Alexandria and its Library were
destroyed soon after the Roman
Emperor Theodosius prohibited
pagan (non-Christian) forms of
worship.
13. The Hellenistic successor kingdoms were
eventually displaced in the Mediterranean
world by Rome.
Rome’s history proper begins when it became
a Republic in 509 BCE. At that time, it was a
small town surrounded by richer, more
populous peoples.
15. Over a three hundred year
time period, Rome’s power
grew and through a continuous
series of wars with its
neighbours, eventually
controlled the entire Italian
peninsula.
Within another century, Roman
power extended across the
Mediterranean world.
16. So how did Rome do it?
Polybius (ca. 200–118 BC), a Greek prisoner of war
tried to explain Rome’s successes for a Greek audience.
He claimed it was due to:
1. Rome’s political system (mixed constitution that
blended aristocratic and democratic elements)
2. Roman army
18. Pax Romana
Rome’s height is generally connected to the Flavian and
Antonine dynasties. During that time, rather than passing
on power to one’s genetic heir, the Emperor would
adopt the “best” Roman to be his son (and who may
even have been older than the “father”).
This time period is often referred to as the Pax Romana
(The Roman Peace), during which trade, engineering,
and the arts flourished.
19. Pax Romana
Its peak coincided with the rule of the so-
called Five Good Emperors (96 – 180 BCE).
Edward Gibbons, the 18th century historian who penned
Decline and Fall of the Roman Empire, described the
period as that “in which the condition of the human race
was most happy and prosperous.”
28. Roman Civic Engineering
Romans were masters at solving practical problems and
appear to have had very sophisticated building and
engineering skills.
29. Much of what we know of regular
Roman life comes from the buried
remains of Pompeii, buried in 79
CE by volcanic eruption.
33. Very little of Herculaneum has been
uncovered. Herculaneum was buried under
20 meters of ash and is now buried as well
by modern buildings in Naples.
44. Images from the so-called Lupanare or Brothel of
Pompeii. Are these images, as most have thought, a
menu for ordering sexual acts, or …
… is the brothel actually a cloak room for a bath house, and
these images are cheeky ways to remind bathers where they
hung their toga while they bathed.
52. Aqueduct in Sergovia, Spain. Notice it turning a corner. The water channel enters an
underground passage just to the left. Romans constructed elaborate water systems for their
cities and generally had a constant gradient drop of 15 to 30 cm every 100 meters. Most were
underground and were about 1m wide by 2m high. Only when they needed to cross a valley or
river was an aqueduct constructed.
53. Pantheon in Rome. Almost two
thousand years after it was built,
the Pantheon's dome is still the
world's largest unreinforced
concrete dome
58. “Kill him! Lash him! Burn him” Why does he meet the sword in such a cowardly way? Why
does he strike so feebly? Why doesn’t he die well? Whip him on his wounds!”
Seneca, Roman philosopher, author of Letters on Morality
60. The so-called Bikini Girls, who appear to have amused
the gladiatorial audience in between events …
61. Roman Religion
Rome’s religion is sometimes referred to as pagan. They
imported Greek and Etruscan deities, renamed them,
and assimilated them into their own beliefs.
Like with the Greeks, Roman religion was oriented
around rituals, such as animal sacrifices, and seemed to
lack any type of eschatology (life after death).
Roman religion appears to have been more like a
contract: quid pro quo [I give you, you give me]
62. Rome’s religion was perhaps best analogous to today’s
patriotism. You participated in official religious rituals to
demonstrate your support of the state.
Indeed, it appears that most of the Roman educated
elite during the height of Rome’s pax romana were
pretty much completely secular.
“Just when the gods had ceased to be, and the Christ had not yet
come, there was a unique moment in history, between Cicero and
Marcus Aurelius, when man stood alone.”
-- Gustave Flaubert
63. On the Nature of Things
Lucretius
On blackboard in class
64. Roman Religion
While Rome’s educated and cultured elite were
secularized, there was also a slow but growing counter-
movement that embraced so-called Mystery
Cults/Religions.
These cults were transplants from the eastern edge of
the Empire.
They provided a personal spirituality focused around
monotheism, mysterious rituals, including rebirth via
baptism in blood or water, salvation, eternal
life/damnation, and a personal relationship with that
single divinity.
65. Some examples: Mithraism, Orphism, Eleusinians,
Dionysianism, Zoroastrianism, Manicheanism,
Christianity.
67. Villa of the Mysteries, Pompeii
One of the richer villas uncovered in Pompeii appears to
have a series of illustrations of a ritual in one of these
mystery religions.
They seem part of a ritual ceremony aimed at preparing
privileged, protected girls for the psychological
transition to life as married women.
70. Roman Religion
In conclusion, Romans were very tolerant of different
religious beliefs as long as the rituals or the beliefs
didn’t interfere with one’s loyalty to the State.
71. Christianity
After Jesus of Nazareth’s death around 31 CE, there
were two factions of his followers:
Aramaic-speaking Jews focused around Jerusalem. Lead
by James, Jesus’s brother.
“Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of
Juda, and Simon? and are not his sisters here with us? And they were offended at
him.” Mark 6:3
More focused on transforming Judaism.
Hellenized, Greek-speaking Christians and Jews. Lead by
Paul, who eventually travelled to Rome.
More focused on converting and spreading the faith.
72. Christianity grew initially almost
completely amongst the lower classes in
Rome and in the eastern provinces of
the Empire.
Much of our knowledge of early Christianity in Rome
is found in the subterranean burial chambers where
the poor seemed to have favoured as a place of
worship.
73. Christianity also seemed to gain an early foothold
amongst upper-class women.
Still, Christianity was very much a fringe religion.
Perhaps 5% of the Roman population across the entire
extent of the Empire was Christian by 200 CE.
76. Statues of last of the
“Good” emperors:
Trajan, Hadrian, Lucius
Vera, Marcus Aurelius,–
notice the regal, imperial
calm of the portraits
77. Unlike his predecessors over the previous 100 years,
Marcus Aurelius did not appoint his successor based on
merit, but instead appointed his son Commodus, a
disastrous choice, who ruled from 180 – 192 CE.
78. Commodus was said to have been more
interested in being a gladiator than an
Emperor, and with him began a period of
radical imperial instability and bad
government.
He renamed Rome to Colonia Commodiana (City of Commodus),
renamed the 12 months of the year to his 12 different names,
declared himself the sole god in Roman religion, etc
Commodus was the villain in the movie Gladiator, and is
one of those rare villains who appear to have actually
been significantly nastier in real life than in their
Hollywood portrayal!
79. Commodus was eventually assassinated (poisoned, His second wife Julia Domna was highly learned
then strangled by his wrestling partner). There in philosophy.
followed the Year of Five Emperors and civil war in
which the general Septimius Severus emerged
victorious.
80. The panel depicts the Roman
Emperor Septimus Severus with his
family: to the left his wife Julia
Domna, in front of them their
sons Geta and Caracalla.
The face of Geta was presumably
erased after Caracalla murdered
his brother.
81. Emperor Caracella Severus (murdered his
brother and co-emperor, ruled 6 years,
killed by his soldiers while urinating).
Caracella made a number of vital
changes to the empire. In 212 all free
men within the Roman Empire became
full Roman citizens. He also increased
the size of the army by 25% and doubled
their pay. He also created an incentive
structure (bonus pay to the soldiers who
supported him on his ascension to the
throne) that was going to help fuel the
Third Century Crisis.
82. For the soldiers, a win-win situation emerged. You would get paid a
bonus for deposing the existing emperor. The new emperor would need
to buy your loyalty to stay in power. Rinse and repeat.
83. The 3rd Century Crisis
Between 235 and 284 there were 25 Emperors. Only one
died of natural causes. There were also dozens of others
who were acclaimed Emperor by their soldiers but who
died before reaching Rome.
It was 50 years of unbelievable anarchy: constant civil
war, complete economic collapse, plague, barbarian
invasions, war with a rival superpower (Sassanids), and
the breakup of parts of the Empire into separate states.
84. Emperor Elagabalus (ruled from 218-222) was a teenaged (14
at ascension) relative of Septimius Severus. Short rule. Was
assassinated.
85. Elagabalus is a controversial figure, who was apparently disliked by his
soldiers for his open homosexuality, his love of female fashion, and his
harem of “husbands” who were expected to dress in female clothes and
wigs.
The Roses of Heliogabalus (1888) by Lawrence Alma-Tadema.
86. Emperor Alexander Severus (ruled from 222-
235) was another teenaged (also 14 at
ascension) relative of Septimius Severus
who also had a rule cut short by
assassination.
91. The silver content of the main roman
currency (the denari) declined to zero
during the crisis
There were no budget deficits
in Roman times. Since coinage
was based on gold and silver,
the only way to control the
economy was to spend less,
tax more, find new gold or
silver, or put less gold and
silver in the coinage.
Because there wasn’t an
effective taxation system, the
massive cost of the army came
through devaluing the
Silver denari under Mainly copper denari currency, which eventually led
Caracella (217 CE) (270 CE) to rampant inflation.
92. During the Crisis of the Third Century, Rome’s vast internal
trade network broke down. Large landowners, no longer able to
successfully export their crops over long distances, began
producing food for subsistence and local barter.
The common free people of the Roman cities, meanwhile, began
to move out into the countryside in search of food and better
protection. Made desperate by economic necessity, many of
these former city dwellers, as well as many small farmers, were
forced to give up hard-earned basic civil rights in order to
receive protection from large land-holders. In doing so, they
became a half-free class of Roman citizen known as coloni. They
were tied to the land, and in later Imperial law their status was
made hereditary. This provided an early model for serfdom,
which would form the basis of medieval feudal society and the
medieval peasantry.
Rome’s relatively large and prosperous middle class more or less
disappeared for good. Wealth appears to have become
concentrated into the hands of a very few rich families.
Roman cities themselves began to change in character. The
large, open cities of Classical antiquity slowly gave way to the
smaller, walled cities.
94. Emperor Balbinus (appointed by Senate,
tried to bring order, murdered by soldiers
within a few months).
Emperor Gordian III, 13 year old orphan,
murdered after leading his army and
defeating the Persians.
95. Emperor Trajanus Decius, forced to become emperor by his
troops, ruled 2 years, died fighting Goths.
Emperor Gallienus, ruled 8 years (a record!), inflicted massive
defeats on Persians, won two gigantic victories against invading
gothic armies in Greece, and defeated the Alemmani who had
invaded Italy. Murdered by his own bodyguard while fighting
breakaway Roman Gallic Empire.
96. Emperor Aurelian (270-275) was one of the finest
generals in Roman history. Successful in reuniting the
Empire. Murdered by his soldiers.
Emperor Claudius Gothicus, ruled 2 years, died
of smallpox plague.
97. Thanks to Auerlian, by late 274, the Roman Empire was
reunited into a single entity, and the frontier troops
were back in place.
More than a century passed before Rome again lost
military ascendancy over its external enemies.
However, dozens of formerly thriving cities, especially in
the Western Empire, had been ruined, their populations
dispersed and, with the breakdown of the economic
system, could not be rebuilt.
Major cities and towns, even Rome itself, had not
needed fortifications for many centuries; many now
surrounded themselves with thick walls.
98. The Crisis had a tremendous effect on the cultural side
as well.
In general, there was a rejection of the optimistic and
secular orientation of classical civilization and a new-
found concern for religious and other-worldly ideals.
Personal religious experiences and salvation via a
compassionate god became increasingly important.
100. Not the Virgin Mary with the
Christ child, but Hermes
holding the infant Dionysus
with nimbus (halo). These
mosaics are from the 4th
century AD from Nea Paphos,
Cyprus
102. Christianity, which was a very minor religious movement
in the Empire, became a bit more widespread (but still a
minority religion, perhaps no more than 10% of
population).
Similar developments can be traced in philosophy, where
Plotinus (205-270) emphasized man's striving for union
with god and made Neoplatonism the dominant
intellectual force among the educated.
103. Diocletian’s Tetrarchy, c. 300 C.E.
When Diocletian (ruled from 284 to 305)
assumed the rule of the Roman Empire, he
did so with the realization that the empire,
with all it's far-flung provinces, was far too
vast to be ruled effectively by one man.
Accordingly, he formed a system of governing
known as the "Tetrarchy", or the rule of Four.
104. The novel idea behind the Tetrarchy was that the empire
would be divided into four quadrants, which were to be
ruled over by two Augustii, who would be assisted by two
Caesars, or "junior emperors".
This system was intended to provide an orderly and
smooth answer to the question of succession.
The two Augustii would be training the two Caesars as their eventual
replacements. Upon the retirement of the Augustii, the two Caesars
would be elevated to the position of Augustii, and would then pick two
new Caesars.
105. Diocletian’s also reformed the economic system which
had become wildly destabilized during the troubles of
the third century. These included price controls, job
classifications, new coinage, broader taxation, etc,
which had mixed results.
106. Diocletian's reforms fundamentally changed the structure
of Roman imperial government and helped stabilize the
empire economically and militarily, enabling the empire
to remain essentially intact for another hundred years
despite having seemed near the brink of collapse in
Diocletian's youth.
He more or less changed the ideological basis of the
Empire from a pseudo-Republic in which the emperor,
army, and senate shared power to a full autocratic
system with the Emperor in complete control.
He also tried to institute a new official monotheistic
State religion (worship of the Sun).
107. Constantine the Great
(ruled as part of Tetrarchy
from 306 to 312; as sole
Emperor from about 312 to
337).
Following Diocletian’s
retirement, there was not
the orderly power transition
as imagined by the
Diocletian Tetrarchy.
Instead, there was another
series of brutal civil wars
followed by the victory of
Constantine.
108. Constantine is perhaps best known for being the first
Christian Roman emperor (though he also had his wife
and eldest son executed).
Emphasized religious uniformity of belief and engaged in
dramatic church building program.
The official Christian Bible and doctrine of the Catholic
Church were codified during Constantine’s reign.
Added Christian belief requirements to army and
government positions.
109. Under Constantine, Rome was divided administratively
into western and eastern halves, each with their own
capital.
The western half’s capital was Rome.
The richer eastern half’s capital was the old small Greek
city of Byzantium, which was renamed Constantinople,
and then massively upgraded and improved.
Constantinople grew in power and became the center of
the Eastern or Byzantine Roman Empire, which lasted
until 1423.
111. Constantinople lies in a very favorable
location that separates Europe from
Asia, the Mediterranean from the Black
Sea. Surrounded by water on three
sides, it is also quite defensible. Huge
walls allowed the Eastern Roman
Empire to survive for over 1000 years.
113. Indeed, until the invention of portable field artillery/cannon by the
Ottoman Turks in the 1400s, Constantinople’s walls were impregnable.
114. After Constantine’s death in 337, there were the usual
civil wars [337-353], followed by Julian (last of the
pagan emperors), Valens, and Theodosius.
Theodosius (379-395) made paganism and other non-
Christian religions illegal.
At the same time, Rome was subjected to significant
waves of barbarian invasions, which ultimately over-ran
most of the Roman Empire, especially in the West.
116. It is believed that these barbarian
movements were caused by the
movement of Huns and other steppe
people from the grasslands of Central
Asia. These nomadic raiders relied on
their horse mobility and the power of
the composite bow (which can be
shot from horseback, unlike a normal
bow).
117. These steppe people appear to have played the key role in
fatally destabilizing not only the Roman Empire, but similar
unified empires in China, India, and Persia.
http://www.flickr.com/photos/todorkamenov/209397447/sizes/o/
119. Rome was sacked first in 410 by the Goths (and then repeatidly over the
next 50 years by others). Eventually, the Western part of the Empire
was replaced with various “Barbarian Kingdoms”. The prosperous and
stable world of antiquity was gone.
http://explorethemed.com/FallRome.asp?c=1
Editor's Notes
Alexander the Great
Note: Should say 4 th Century BCE not 5 th Century
Comparison of classic-era Greek hoplite versus Macadeonian phalangite with sarissa (over 6m/19ft).
Macadeonian phalanx required level ground but was very effective. The Roman general Aemilius Paulus wrote that when he first saw the phalanx, it was the most terrifying thing he had ever seen.
Alexander’s conquests spread greek culture throughout the near eastern world. After his death, the so-called Successor kingdoms were ruled by a variety of Greek rulers. Shown here are the great library and lighthouse at Alexandria (near modern day Cairo).
For a 3D virtual tour through ancient Rome, see http://www.romereborn.virginia.edu/gallery-current.php
Roman portraiture: focus on realistic portrayals. Evidence of extreme respect for experience and age.
Heads of Emperors Vespasian and Titus.
Bust of Flavian Woman.
Not every Roman matron looked good in the newest Flavian hairstyle!
Arial view and location of Pompeii, buried in 79 CE.
Very little of Herculaneum has been uncovered. Herculaneum was buried under 20m of ash!
Villa of Livia
A variety of frescos uncovered in Pompeii
Cave Canem - Beware of Dog - mosaics, Pompeii
Timgad, Algeria, early 2nd century – typical roman city created from scratch in a conquered province for ex-soldiers.
http://www.gadarg.org.uk/frocester.htm
Aqueduct in Pont-du-Gard in France
Aqueduct in Sergovia, Spain. Notice it turning a corner. The water channel enters an underground passage just to the left. Romans constructed elaborate water systems for their cities and generally had a constant gradient drop of 15 to 30 cm every 100 meters. Most were underground and were about 1m wide by 2m high. Only when they needed to cross a valley or river was an aqueduct constructed.
Baths of Caracalla, Rome, c. 211-217 C.E.
Bikini Girls from the Piazza Armerina
Mystery religions were not in opposition to the state religion. Rather they provided a
Statues of Trajan, Hadrian, Marcus Aurelius, Septimius Severus – notice the regal, imperial calm of the portraits
Roman portrait of the second-century emperor Commodus in the Vatican Museums. A.D. 180-192. Commodus as Herules.
After the assassination of Commodus, there followed a year of civil wars in which the general Septimius Severus emerged victorious. His second wife Julia Domna was highly learned in philosophy.
The panel depicts the Roman Emperor Septimus Severus with his family: to the left his wife Julia Domna, in front of them their sons Geta and Caracalla.
Emperor Caracella Severus (murdered his brother and co-emperor, ruled 6 years, killed by his soldiers while urinating). Caracella made a number of vital changes to the empire. In 212 all free men within the Roman Empire became full Roman citizens. He also increased the size of the army by 25% and doubled their pay. He also created an incentive structure (bonus pay to the soldiers who supported him on his ascension to the throne) that was going to help fuel the Third Century Crisis.
For the soldiers, a win-win situation emerged. You would get paid a bonus for deposing the existing emperor. The new emperor would need to buy your loyalty to stay in power. Rinse and repeat.
Emperor Elagabalus (ruled from 218-222) was a teenaged (14 at ascension) relative of Septimius Severus. Short rule. Was assassinated.
Elagabalus is a controversial figure, who was apparently disliked by his soldiers for his open homosexuality, his love of female fashion, and his harem of “husbands” who were expected to dress in female clothes and wigs. The Roses of Heliogabalus (1888) by Lawrence Alma-Tadema.
Emperor Alexander Severus (ruled from 222-235) was another teenaged (also 14 at ascension) relative of Septimius Severus who also had a rule cut short by assassination.
Crisis of the Third Century (235–284 AD) was a period in which the Roman Empire nearly collapsed under the combined pressures of invasion, civil war, plague, and economic depression. The Crisis began with the assassination of Emperor Alexander Severus at the hands of his own troops, initiating a fifty-year period in which 20–25 claimants to the title of Emperor, mostly prominent Roman Army generals, assumed imperial power over all or part of the Empire. Nonstop civil wars encouraged barbarian invasions. Smallpox plague in 251-270 also greatly reduced the population of the Empire. Over 5000 people a day supposedly died in Rome itself during its height.
By 258–260, the Empire split into three competing states: the Gallic Empire, including the Roman provinces of Gaul, Britannia and Hispania; the Palmyrene Empire, including the eastern provinces of Syria Palaestina and Aegyptus; and the Italian-centered and independent Roman Empire, proper, between them.
At the same time, the Empire was challenged by the rise of a competing superpower, the Sassanid Empire.
Victory of Sapor (over Emperor Valerian) in 260 CE
There were no budget deficits back then. Since coinage was based on gold and silver, the only way to control the economy was to spend less, tax more, find new gold or silver, or put less gold and silver in the coinage. Because there wasn’t an effective taxation system, the massive cost of the army came through devaluing the currency, which eventually led to rampant inflation. During the Crisis of the Third Century Rome’s vast internal trade network broke down. Large landowners, no longer able to successfully export their crops over long distances, began producing food for subsistence and local barter. The common free people of the Roman cities, meanwhile, began to move out into the countryside in search of food and better protection. Made desperate by economic necessity, many of these former city dwellers, as well as many small farmers, were forced to give up hard-earned basic civil rights in order to receive protection from large land-holders. In doing so, they became a half-free class of Roman citizen known as coloni . They were tied to the land, and in later Imperial law their status was made hereditary. This provided an early model for serfdom, which would form the basis of medieval feudal society and the medieval peasantry. Rome’s relative large and prosperous middle class more or less disappeared for good. Wealth appears to have become concentrated into the hands of a very few rich families. Roman cities themselves began to change in character. The large, open cities of Classical antiquity slowly gave way to the smaller, walled cities
Emperor Maximinus (first barbarian emperor, assinated Caracella, ruled for 3 years, murdered); Emperor Gordian I (ruled at same time, dead within 20 some days)
Emperor Balbinus (appointed by Senate, tried to bring order, murdered by soldiers within a few months). Emperor Gordian III, 13 year old orphan, murdered after defeating the Persians
Emperor Trajanus Decius, forced to become emperor by his troops, ruled 2 years, died fighting Goths. Emperor Gallienus, ruled 15 years (a record!), inflicted massive defeats on Persians, recaptured Antioch, won two gigantic victories against invading gothic armies in Greece, defeated the Alemmani who had invaded Italy, murdered by his own bodyguard while fighting breakaway Roman Gallic Empire.
Emperor Aurelian (270-275) was one of the finest generals in Roman history. Successful in reuniting the Empire. Murdered by his soldiers. By late 274, the Roman Empire was reunited into a single entity, and the frontier troops were back in place. More than a century passed before Rome again lost military ascendancy over its external enemies. However, dozens of formerly thriving cities, especially in the Western Empire, had been ruined, their populations dispersed and, with the breakdown of the economic system, could not be rebuilt. Major cities and towns, even Rome itself, had not needed fortifications for many centuries; many now surrounded themselves with thick walls.
Not the Virgin Mary with the Christ child, but Hermes holding the infant Dionysus with nimbus (halo). These mosaics are from the 4th century AD from Nea Paphos, Cyprus http://www.flickr.com/photos/7549203@N04/3328213281/in/set-72157615992433806/
Ceiling from Constantinine palace in Trier. Circles of light indicate regal importance
Diocletian’s Tetrarchy, c. 300 C.E. When Diocletian (ruled from 284 to 305) assumed the rule of the Roman Empire, he did so with the realization that the empire, with all it's far-flung provinces, was far too vast to be ruled effectively by one man. Accordingly, he formed a system of governing known as the "Tetrarchy", or the rule of Four. The novel idea behind the Tetrarchy was that the empire would be divided into four quadrants, which were to be ruled over by two Augustii, who would be assisted by two Caesars, or "junior emperors". This system was intended to provide an orderly and smooth answer to the question of succession. The two Augustii would be training the two Caesars as their eventual replacements. Upon the retirement of the Augustii, the two Caesars would be elevated to the position of Augustii, and would then pick two new Caesars. Diocletian’s also reformed the economic system which had become wildly destabilized during the troubles of the third century. These included price controls, job classifications, new coinage, broader taxation, etc, which had mixed results. Diocletian's reforms fundamentally changed the structure of Roman imperial government and helped stabilize the empire economically and militarily, enabling the empire to remain essentially intact for another hundred years despite having seemed near the brink of collapse in Diocletian's youth. He more or less changed the ideological basis of the Empire from a pseudo-Republic in which the emperor, army, and senate shared power to a full autocratic system with the Emperor in complete control.
Constantine the Great (ruled as part of Tetrarchy from 306 to 312; as sole Emperor from about 312 to 337) . Following Diocletian’s retirement, there was not the orderly power transition as imagined by the Diocletian Tetrarchy. Instead, another series of brutal civil wars followed by the victory of Constantine . Constantine is perhaps best known for being the first Christian Roman emperor (though he also had his wife and eldest son executed). Emphasized religious uniformity of belief and engaged in dramatic church building program.
Under Constantine, Rome was divided administratively into western and eastern halves, each with their own capital. The western half’s capital was Rome. The richer eastern half’s capital was the old small Greek city of Byzantium, which was renamed Constantinople, and then massively upgraded and improved. Constantinople grew in power and became the center of the Eastern or Byzantine Roman Empire, which lasted until 1423.
Constantinople lies in a very favorable location that separates Europe from Asia, the Mediterranean from the Black Sea. Surrounded by water on three sides, it is also quite defensible. Huge walls allowed the Eastern Roman Empire to survive for over 1000 years.
Indeed, until the invention of portable field artillery/cannon by the Ottoman Turks in the 1400s, Constantinople’s walls were impregnable.
So while the rest of the Roman Empire was wracked by a series of barbarian invasions in the 400s, Constantinople was untouched.
It is believed that these barbarian movements were caused by the movement of Huns and other steppe people from the grasslands of Central Asia. These nomadic raiders relied on their horse mobility and the power of the composite bow (which can be shot from horseback, unlike a normal bow).