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Daughter of Władysław I oświęcimski of Auschwitz, książę and Eufrozyna mazowiecka of Plock Wife of Szécsényi Tamás Sister of Jan I Scholastyk Von Oswietim Piast, prince; Anna and N.N.
http://genealogy.euweb.cz/piast/piast8.html#AWA
D1. Wladislaw Duke of Auschwitz, *1275/80, +1321/24; m.1304/09 Euphrozyna (+after 1327) dau.of Duke Boleslaw II of Plock