| House de la Cerda|
1275, Ciudad Real, Spain
| Violant of Aragon|
Alfonso X of Castile
| Blanche of France, Infanta of Castile (m. 1268–1275)|
Ferdinand de la Cerda, Lord of Lara
Alfonso X of Castile, Violant of Aragon
Peter of Castile, Lord of Ledesma, Constance of Castile
Alfonso X of Castile, Violant of Aragon, Sancho IV of Castile, Maria de La Cerda y de Lara, Ferdinand III of Castile
Ferdinand de la Cerda Wikipedia
Ferdinand de la Cerda (1255–1275) was the heir apparent to the Crown of Castile as the eldest son of Alfonso X and Violant of Aragon. His nickname, de la Cerda, means "of the bristle" in Spanish, a reference to being born with a full head of hair.
In November 1268 he married Blanche, the daughter of King Louis IX of France. They had two sons:Alfonso de la Cerda (1270-1333), who was believed to have married Matilde of Narbonne, daughter of Viscount Aimery VI of Narbonne. Recent research showed that Alfonso de la Cerda married Matilde of Brienne, daughter of John I of Brienne. They had four sons and three daughters.
Fernando de la Cerda (1275-1322), who married Juana Núñez de Lara, called "la Palomilla", Lady of Lara & Herrera, daughter of Juan Núñez de Lara “el Mayor” and Teresa Álvarez de Azagra. They had one son and three daughters. One daughter, Blanca Núñez de Lara, was the mother-in-law to King Henry II of Castile.
Ferdinand predeceased his father in 1275 at Ciudad Real from wounds received at the Battle of Écija. His sons did not inherit the throne of their grandfather, since their uncle Sancho usurped the throne.