The Almagest of Ptolemy was authoritative in astronomy for centuries. Ulugh Beg. SKU: ; Ulugh Beg – his Book of the fixed Stars by Al-Sufi. Numerous manuscripts of. by. 38r and 38v) show the Ethiopian king of Greek mythology in fifteenth-century Timurid garb and with the facial features of Ulugh Beg, his fine beard rendered. from all Persian manuscripts existing in Great Britain, with a vocabulary of Persian and Arabic words. . Ulugh Beg's catalogue of stars: Rev.