Question: When did Ulrich Ii, Count Of East Frisia's mother die?
Sentence (from "Ulrich II, Count of East Frisia"): Ulrich II of East Frisia, was count of East Frisia, (6 July 1605 – Aurich, 1 November 1648) was the fifth child and the third son of Enno III, Count of East Frisia and Anna of Holstein-Gottorp.
Relevant evidence: Yes