Ferdinand de la Cerda

Ferdinand de la Cerda (died 1275) was the Crown Prince of Castile, eldest son of King Alfonso X of Castile. His nickname, de la Cerda, means "of the hairs" in Spanish, a reference to his being born with hair sprouting from his chest.

He married in November 1268 to Princess Blanche of France, the daughter of King Louis IX of France. They had two sons:

1. Alfonso (1270-1324), who married Mafalda of Narbonne.
2. Fernando (1275-1322), who married Juana Nunez de Lara

Ferdinand predeceased his father in 1275 at Ciudad Real. His sons did not inherit the throne of their grandfather, since their uncle, the second son, Sancho, enforced his claim, even by rebelling.