- (1354-1394) Daughter of Pedro of Castile and María de Padilla.
- Married John of Gaunt (1371), giving birth to two children: Catherine (1373-1418) future wife of Enrique III of Castile, and Juan (1374-1375).
- Her father proposed her marriage to Prince Dom João, son of Pedro of Portugal and Inês de Castro (1358), but the plan did not go ahead.
Constança