Question: Who is the maternal grandfather of Angela De' Rossi?
Sentence (from "Bianca Riario"): Bianca Riario (March 1478 – 1522) was an Italian noble and regent, Marchioness of San Secondo by marriage to Troilo I de' Rossi, and regent of the marquisate and county of San Secondo for her son Pier Maria during his minority between 1521 and 1522.
Relevant evidence: No