This document provides an overview of Muslim extremism from a historical perspective. It discusses key figures and events that helped shaped extremist movements like Salafism, Muslim Brotherhood, Al Qaeda, and Hamas. These include Ibn Taamiya in the Middle Ages, Sayyid Qutb and his influential book Milestones, and current leaders like Ayman al-Zawahiri, Usama bin Laden, and Khalid Mashal of Hamas. The document also examines the roles of Iran, Syria, Hezbollah, and Muqtada al-Sadr in relation to extremism.