Al-Qādisiyyah is an ancient city, located in Iraq, southwest of al-Hillah and al-Kūfah. It is known for the Battle of al-Qādisiyyah in 636, in which Arab-Muslim invaders defeat a larger army of the Sāsānian Empire.
The Arab Muslims who took part in the war became known as ‘’ahl al-Qādisiyyah’’. The end of the Sassanian rule in Iraq was the occupation of their capital Ctesiphon. The Siege of the city lasted for two months, before it was finally taken in March 637 A.D.