Descendants of Alfonso IX, King of Castile
House of Trastámara
Henry of Trastámara (1334 – 1379) Count of Trastámara
- Henry of Trastámara (1334 – 1379) Count of Trastámara, illegitimate son of Alfonso IX, King of Castile and León, later Henry II of Castile and Leon. See Kingdom of Castile and León
House of Enríquez
Fadrique Alfonso of Castile (1334 – 1358) 1st Lord of Haro
- Fadrique Alfonso of Castile (1334 – 1358) 1st Lord of Haro, Master of the Order of Santiago, illegitimate son of Alfonso IX, King of Castile and León.
Alfonso Enríquez of Castile (1354 – 1429) 1st Lord de Medina de Río Seco
- Alfonso Enríquez of Castile (1354 – 1429) 1st Lord de Medina de Río Seco, illegitimate son of Fadrique Alfonso of Castile.
Dukes of Medina de Rioseco
Ancestor of the Admirals of Castile, Viscounts of Cabrera, Counts of Melgar and Rueda, Dukes of Medina de Rioseco
House of Aguilar de Campoo
Tello Alfonso of Castile (1337 – 1370) Infante of Castile
- Tello Alfonso of Castile (1337 – 1370) Infante of Castile and 1st of Aguilar de Campoo, illegitimate son of Alfonso IX, King of Castile and León.
Marquises of Aguilar de Campoo
Ancestor of the Lords of Aguilar de Campoo, Marquises of Aguilar de Campoo and Counts of Castañeda through illegitimate descent.
Sancho Alfonso of Castile (1342–1374) Infante of Castile
- Sancho Alfonso of Castile (1342–1374) Infante of Castile, 1st Count of Alburquerque, illegitimate son of Alfonso IX, King of Castile and Leon. Married Beatrice of Portugal (c. 1354 – 1381) daughter of Peter I, King of Portugal. Their daughter Eleanor of Alburquerque. (c. 1374 – 1435) married Ferdinand I, King of Aragon.
Descendants of Henry II, King of Castile
House of Noronha
Alfonso Enriquez (1355 – c. 1400) Count of Gijón and Noreña
- Alfonso Enriquez (1355 – c. 1400) Count of Gijón and Noreña, illegitimate son of Henry II, King of Castile. Married Isabella of Portugal (1364–1395) illegitimate daughter of Ferdinand I, King of Portugal.
Dukes of Caminha
Ancestors of the Counts of Vila Real, Acoutim and Valença, Marquises of Vila Real, Dukes of Caminha.
Fadrique de Castilla (1360–1394) Duke of Benavente
- Fadrique de Castilla (1360–1394) Duke of Benavente, illegitimate son of Henry II, King of Castile.
Enrique de Castilla (1378–1404) Duke of Medina Sidonia
- Enrique de Castilla (1378–1404) Duke of Medina Sidonia, illegitimate son of Henry II, King of Castile.
Descendants of Peter, King of Castile
John of Castile (1355 – 1405) Infante of Castile
- John of Castile (1355 – 1405) Infante of Castile, illegitimate son of Peter, King of Castile.