Question: Who is Margaret Of Bavaria, Marchioness Of Mantua's maternal grandmother?
Sentence (from "Anna of Brunswick-Grubenhagen-Einbeck"): Anna of Brunswick-Grubenhagen-Einbeck (1414 – 4 April 1474) was a daughter of Duke Eric I of Brunswick-Grubenhagen and his wife, Elisabeth of Brunswick-Göttingen.
Relevant evidence: Yes