The assumption that Euphemia was a daughter of Count Günter of Arnstein-Lindow-Ruppin is based, according to Ursula Scheil, on a misunderstanding and was disproved by her in 1945 in the Genealogie der Fürsten von Rügen ("Genealogy of the Princes of Rügen" (1164-1325), Greifswald), however the story is now widespread. See Die Kinder Wizlaws II
