Rabbi David Drucker (approx. 1518-1600), son of Shlomo Ashkenazi Luria and Dinah Rappaport, married to Kendel Isserles (sister of the REMA, Moses Isserles) was the father-in-law of Saul Wahl Katzenellenbogen, the famous so-called King of Poland for one night.
There is lots of information on genealogical sites.
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David Seldner, Karlsruhe, Germany
seldner@...