Question: Who is Anne Of Ostfriesland's paternal grandmother?
Sentence (from "Anne of Ostfriesland"): Anne of Ostfriesland (Aurich, June 26, 1562 – Neuhaus upon Elbe, April 21, 1621) was the eldest daughter of Edzard II, Count of East Frisia and his wife, Katarina Vasa, daughter of Gustav I of Sweden.
Relevant evidence: Yes