Mattias de' Medici 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.
- Occupation
- politician
- Position held
- Governor of Siena
- Born
- May 9, 1613
- Died
- October 11, 1667