Question: Who is Euphemia Of Kuyavia's paternal grandfather?
Sentence (from "Euphemia of Kuyavia"): The only preserved evidence of Euphemia's existence is from Jan Długosz's Yearbooks, which reported that on March 18, 1308 Euphemia died and that she was the daughter of Prince Casimir and the wife of Yuri I, who died in the same year on April 21, which was also his birthday.
Relevant evidence: No