Karkasani (Qirqisani), Abu Yusuf Yakub (Iacob; Kirkisani, Jacob)
- (fl. 10th cent)Babylonian Karaite scholar. He came from Karkasan near Baghdad. He was the most important proponent of Karaism of his age. His Book of Lights and Watch-Towers is a systematic code of Karaite law. In Book of Gardens and Parks he commented on the non-legal parts of the Torah.
Dictionary of Jewish Biography. Dan Cohn-Sherbok.