Isma'il ibn Musa (Arabic: إسماعيل بن موسى القسوي) (fl. ca.
850–889) was a Muslim lord in the Upper March (Arabic: الثغر الأعلى, aṯ-Ṯaḡr al-Aʿlà) of al-Andalus, as well as walī of Larida.
Once liberated, he joined the revolt initiated by all his brothers against Muhammad I, to the end of 870, even forming an alliance with the Kingdom of Pamplona and King Alfonso III of Asturias[1] Isma'il seized Zaragoza and Montsó in 872, and about this time formed a marriage alliance, wedding Sayyida, daughter of 'Abd Allah ibn Jalaf, of the Banu Jalaf of Barbitanya.
In 882, his own nephew, Muhammad ibn Lubb (loyal to Córdoba), made him prisoner,[1] but he was set free again a short time later.
However, the precise dating of the martyrdom is disputed, and since nothing is known of the earlier rulers of Huesca and some details of the story seem inconsistent with what is known of the Banu Qasi, Zumael may instead have been an otherwise unknown Cordoba-appointed predecessor of Musa.