Merida was founded in 25 BC by Publio Carisio in the reign of Emperor Augustus and was originally named "Augusta Emerita". It served as the capital of the Roman province of Lusitania. Merida became an important city for the economy, military, and culture of the Roman Empire, growing to have more prominence than Athens. Some of Merida's most important surviving Roman monuments include the 16 BC theatre constructed by consul Marco Vipsanio, a large 1st century circus located outside the city walls, and the Roman bridge spanning the Guadiana River.