Saul Wahl Katzenellenbogen (1541–1617) was a wealthy and politically influential Polish Jew who is in Jewish folk legends said to have briefly occupied the throne of Poland on 18 August 1587. He has historically borne the nickname, "Le roi d'un jour" (king for a day).
Saul's father was Samuel Judah Katzenellenbogen. granddaughter of Israel ben Josef and niece of Moses Isserles, with whom he had thirteen children, including the renowned Polish rabbi Meir and Henele Wahl Katzenallenbogen, wife of Ephraim Zalman Shor.
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