Castile

The Castilian House of Burgundy was a cadet line of the House of Ivrea, founded when Raymond of Burgundy joined Alfonso VI's court around 1087, married his heiress Urraca and received Galicia. Their son Alfonso VII inherited León and Castile in 1126, but on his death in 1157 the realms split between his sons, until Ferdinand III reunited them and added Córdoba in 1236 and Seville in 1248 to the reconquered south.

His marriage to Joan, heiress of Aumale, planted a junior line in northern France as counts of Aumale. Alfonso X the Wise, king from 1252, compiled the Siete Partidas but left a disputed succession.

In 1337 Alfonso XI ruled; he routed the Marinids at the Río Salado in 1340 and took Algeciras in 1344. His son Peter I, called the Cruel, was killed at Montiel in 1369 in the Castilian Civil War by his illegitimate half-brother, who ruled as Henry II and founded the Trastámara line, of the same Burgundian stock.