Siege of Ctesiphon

The siege of Ctesiphon took place from January to March 637, shortly after the Rashidun Caliphate defeated the Sasanian Empire in the Battle of al-Qadisiyyah. As it had served as the Persian capital city since the Parthian period, the Rashidun victory at Ctesiphon was one of the most significant events of the Muslim conquest of Persia; Muslim rule was consolidated over all of Mesopotamia.