Peter I, Duke of Brittany
French ruler
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Peter I, also known as Peter Mauclerc, was Duke of Brittany jure uxoris from 1213 to 1221, and regent of the duchy for his minor son John I from 1221 to 1237. As duke he was also 1st Earl of Richmond from 1218 to 1235. Wikipedia
Born: 1187, Dourdan, France
Died: May 1250 (age 63 years)
Grandchildren: John II, Duke of Brittany, Hugh XII of Lusignan, Alix of Brittany, Dame de Pontarcy, and more
Parents: Robert II, Count of Dreux and Yolande de Coucy
Children: John I, Duke of Brittany, Yolande of Brittany, and Olivier Ier de Machecoul
Spouse: Alix, Duchess of Brittany (m. 1213) and Margaret of Commequiers
House: Dreux