Question: Who is Humphrey Of Montfort's maternal grandmother?
Sentence (from "Diana Guardato"): Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
Relevant evidence: No