- (c. 1371-1404) Son of Bernard de Béarn, 'the bastard of Béarn', and of Isabel de la Cerda, a descendant of Alfonso X of Castile. Grandson of Gaston III, Count of Foix-Béarn (1331-1391).
- 2nd Count of Medinaceli.
- Served in the court of Juan I and Enrique III of Castile.