Isaac ben Abraham of Troki, Karaite scholar and polemical writer (b. Trakai, Grand Duchy of Lithuania, c. 1533; d. Trakai, c. 1594 (or eight years earlier for both dates, according to Jacob Mann's hypothesis. Since the formation of the Polish–Lithuanian Commonwealth in 1569, still during Isaac ben Abraham's own lifetime, the city was also known in Polish as Troki). Source: Wikipedia (en)