The Battle of al-Qādisiyyah (Arabic: معركة القادسيّة‎; transliteration, Maʿrakat al-Qādisiyyah; Persian: نبرد قادسيه‎; alternate spellings: Qadisiyya, Qadisiyyah, Kadisiya) was the decisive engagement between the Arab-Muslim army and the Sāsānian Iranian army during the first period of Muslim expansion which resulted in the Arab-Muslim conquest of Iran. In the centuries following the battle, Qādisiyyah became enshrined in Muslim collective memory as a symbol of the successes of early Islamic history.