Gond-i Shahanshah ("the army of the Shahanshah"), also known by its Arabicized form of Jund-i Shahanshah, was the name of the 4,000 Daylamite elite unit of the Sasanian king. They originally lived in Daylam, but were resettled in Ctesiphon by Khosrow II (r. 590-628), probably some time after 600. After the Sasanian Empire suffered a major defeat in 636 to the Arabs at the battle of al-Qadisiyyah, the Gond-i Shahanshah defected to the Arabs, converted to Islam, and settled in Kufa, where they had their own quarter.