Mattias de’ Medici (Governer of Siena 1629 – 1667)
Mattias de’ Medici (May 1613 – October 1667) was the third son of Grand Duke Cosimo II de’ Medici of Tuscany and Archduchess Maria Maddalena of Austria. He was governor of Siena, with interruptions, from 1629. He never married.
- Wikipedia for background, portrait.