Question: Who is Stefano Visconti's paternal grandmother?
Sentence (from "Stefano Visconti"): In 1318 he married Valentina Doria, daughter of Bernabò Doria from Sassello and of Eliena Fieschi, with whom he had three children: Matteo II, Galeazzo II and Bernabò, who shared the rule in Milan after his death.
Relevant evidence: No