Al-Qādisiyyah (Arabic: القادسية) is a historical city in southern Mesopotamia, southwest of al-Hillah and al-Kūfah in Iraq.
[2] Al-Qādisiyyah was the scene of a decisive battle in the conquest of Persia by the Arabs around 636.
[3] The Muslim troops of the caliph `Omar led by Sa`d ibn Abī Waqqās despite their outnumbered forces defeated the army of the Sassanid emperor Yazdgard III, led by Rostam Farrokhzād.
The battle of Al-Qādisiyyah would later be depicted in a manuscript of Shahnameh, a national epic authorized by the Persian poet Ferdowsi.
Another Qādisiyyah existed on the Tigris River, off the road between Baghdād and Sāmarrā', not very far from the Euphrates city.