Abū al-Qāsim Aḥmad ibn al-Ḥusayn ibn Qāsī

Silver coin issued by Hamdin and Ibn Wazir, allies of Ibn Qasi.

Abūʾl-Qāsim Aḥmad ibn al-Ḥusayn ibn Qasī (died 1151) was a Sufi, a rebel leader against the Almoravid dynasty in Al-Garb Al-Andalus and governor of Silves for the Almohads. The main sources for his life are Ibn al-Abbār, Ibn al-Khaṭīb and ʿAbd al-Wāḥid al-Marrakūshī. The last is the source for his biography in the biographical dictionary of al-Ṣafadī.

He was of native Iberian stock, rūmī al-aṣl in the words of Ibn al-Abbār. He was born at Silves, but the date of his birth is unknown. His name sustains the possibility that he was a descendant of the Banu Qasi, that had once staged a rebellion against the Emirate of Cordoba. According to Ibn al-Abbār, he was a minor government official at Silves, while Ibn al-Khaṭīb describes him as a spendthrift. He eventually sold all his goods, gave the money to the poor and became a murīd. He studied under Khalaf Allāh al-Andalusī and Ibn Khalīl in Niebla, although he may also have met Ibn al-ʿArīf in Almería. His main influences were the Encyclopedia of the Brethren of Purity (Ibn al-Abbār) and the works of al-Ghazālī (Ibn al-Khaṭīb).