Question: Who is Otto Vi, Margrave Of Brandenburg-Salzwedel's maternal grandmother?
Sentence (from "Frederick I, Elector of Brandenburg"): Frederick( Middle High German:" Friderich," Standard German:" Friedrich"; 21 September 1371 – 20 September 1440) was the last Burgrave of Nuremberg from 1397 to 1427( as Frederick VI), Margrave of Brandenburg- Ansbach from 1398, Margrave of Brandenburg- Kulmbach from 1420, and Elector of Brandenburg( as Frederick I) from 1415 until his death.
Relevant evidence: No