Question: Who is Gianfrancesco Gonzaga (1446–1496)'s maternal grandmother?
Sentence (from "Barbara of Brandenburg, Marquise of Mantua"): Barbara of Brandenburg (1422 – 7 November 1481) was a Marchioness consort of Mantua, married in 1433 to Ludovico III Gonzaga, Marquis of Mantua.
Relevant evidence: No