Question: Who is Gianfrancesco Gonzaga (1446–1496)'s maternal grandmother?
Sentence (from "Gianfrancesco Gonzaga (1446–1496)"): Gianfrancesco Gonzaga (1446 - 28 August 1496) was the third son of Ludovico III Gonzaga, Marquess of Mantua and Barbara of Brandenburg.
Relevant evidence: Yes