a commentary to Ptolemy's Almagest, an important text on astronomy. (Melekhet ha-Mispar; is a similar work attributed to Mizrachi, which additionally contains a chapter on chess). A commentary on Euclid's Elements, a fundamental mathematics text. References 1450s births 1525 deaths Romaniote Jews Rabbis from Istanbul Chief rabbis of the Ottoman Empire 15th-century rabbis from the Ottoman Empire 16th-century rabbis from the Ottoman Empire Jewish astronomers