Question: When did Ulrich Ii, Count Of East Frisia's mother die?
Sentence (from "Anna of Holstein-Gottorp"): Anna of Holstein-Gottorp (27 February 1575 – 24 April 1610) was a German noblewoman, daughter of Duke Adolf of Holstein-Gottorp and Landgravine Christine of Hesse (daughter of Landgrave Philip I of Hesse).
Relevant evidence: Yes