Yolande of Brittany, also known as Yolande de Dreux, was the ruler of the counties of Penthièvre and Porhoet in the Duchy of Brittany. Yolande had been betrothed to King Henry III of England in 1226 at the age of seven years, but married Hugh XI of Lusignan, the half-brother of Henry III. Through Hugh, she became Countess of La Marche and of Angoulême. She was the mother of seven children. From 1250 to 1256, she acted as Regent of La Marche and Angoulême for her son, Hugh XII of Lusignan.

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.