Jacob Querido (d. 1690 in Alexandria, Egypt) was the successor of the self-proclaimed Jewish Messiah Sabbatai Zevi. Born in Salonika, he was the son of Joseph the Philosopher and brother-in-law of Sabbatai Zevi. His sister, Sabbatai's widow, claimed that he was actually her son by Sabbatai, so that he might succeed to the leadership of Sabbatai's followers. He attracted a considerable following of his own. Wikipedia
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