Question: What is the date of death of Mattias De' Medici's father?
Sentence (from "Mattias de' Medici"): Mattias de' Medici (9 May 1613 – 11 October 1667) was the third son of Grand Duke Cosimo II de' Medici of Tuscany and Archduchess Maria Maddalena of Austria.
Relevant evidence: Yes