House of Foix (Bella Gerant Alii)

The House of Foix is a noble family originating in Bearn, north of the Pyrenees. The family rose to monarchy when Gaston IV de Foix married off his son to a daughter of the last king of France. When France was defeated in the Hundred Years War, Gaston rallied the nobility of Aquitaine  and declared independence for Aquitaine, which was recognised by Burgundy in 1466. Gaston then married his daughter to Francis II; the Duke of Brittany, becoming grandfather to both the Duke of Aquitaine and Duchess of Brittany

Union of Aquitaine and Brittany
Duchess Anna of Brittany had a daughter by her second husband, Geoffrey of Angers; Henrietta, who succeeded her mother to the Duchy.

Francis III, the young successor to Francis II of Aquitaine, married the heiress, uniting the two duchies under the House of Foix.

Navarrese Kings
In 1623, Navarre became independent. The Navarrese nobles wished to elect one of themselves but, after rough persuasion, accepted Henry II as their king; a younger cousin of Duke Geoffrey III, forcing Henry to renounce his claim on the Aquitanian throne on behalf of himself and his descendants.