Abraham Zacuto
Abraham Zacuto (Hebrew: אַבְרָהָם בֵּן שְׁמוּאֵל זַכּוּת, romanized: Avraham ben Shmuel Zacut, Portuguese: Abraão ben Samuel Zacuto; 12 August 1452 – c. 1515) was a Sephardic Jewish astronomer, astrologer, mathematician, rabbi and historian. Born in Castile, he served as Royal Astronomer to King John II of Portugal before fleeing to Tunis.