Abū Isḥāq al-Kūbunānī, Abū Isḥāq b. ʿAbd Allāh Kūbunānī Yazdī (d. after 886/1481), was a Persian mathematician, astronomer and man of letters. In a manuscript of one of his works, he is referred to as ‘Abū Isḥāq Shaykhzādah b. al-Khādim al-Burhānī al-Kūbunānī’ (Ḥall masʾala, fol. 189b). As his title indicates, he was born in Kūbunān (originally Kūh-bunān, a rural district approximately 150 km north-west of Kirmān). The discovery of a manuscript of his Munshaʾāt has provided us with some information on his life. Although lit…