House de la Cerda
Encyclopedia
House de la Cerda is a noble line of the Crown of Castile
Crown of Castile
The Crown of Castile was a medieval and modern state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and parliaments of the kingdoms of Castile and León upon the accession of the then King Ferdinand III of Castile to the vacant Leonese throne...

 descending from the Infante Ferdinand de la Cerda, eldest son of King Alfonso X. It was one of four noble lineages that arose directly from the Castilian royal family during the thirteenth century and is the origin of the Dukes of Medinaceli
Duke of Medinaceli
Duke of Medinaceli is a Spanish noble title given to Luis de la Cerda y de la Vega on 31 October 1479, by the Catholic Monarchs, Isabella I of Castile and Ferdinand II of Aragon when the old title of Count of Medinaceli, awarded to his grandfather, Bernal de Foix, in 1368, whereby was transformed...

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The origin of the lineage stems from Infante Alfonso de la Cerda (1270-1333)
Alfonso de la Cerda (1270-1333)
Alfonso de la Cerda, , called "the disinherited,, was the elder son of Ferdinand de la Cerda and his wife Blanche of France, and was a grandson of Alfonso X of Castile. Alfonso and his brother Fernando were candidates for the Castilian-Leonese crown during the reigns of Sancho IV of Castile,...

, son of the heir to the throne, Infante Ferdinand de la Cerda who died before his father, Alfonso X. The Alfonso X always stated his successor was his grandson Alfonso de la Cerda, instead of his second son, Infante Sancho
Sancho IV of Castile
Sancho IV the Brave was the King of Castile, León and Galicia from 1284 to his death. He was the second son of Alfonso X and Yolanda, daughter of James I of Aragon.-Biography:...

. This motivated Sancho to revolt against his father. After a long civil war Sancho was finally crowned. Following an unsuccessful invasion by Aragon and Portugal, a peace settlement removed the Infante de la Cerdas from contention for the Castilian throne.

The lineage of La Cerda continued throughout the Middle Ages and was constituted as a noble house of the first rank, playing a leading role in Castilian politics. This line, like others from the Civil War of mid-fourteenth century, continued through the female line to shift the family heirloom until Dona Isabel de la Cerda
Isabel de la Cerda
Isabel de la Cerda also known as Isabel de la Cerda Pérez de Guzmán Isabel de la Cerda also known as Isabel de la Cerda Pérez de Guzmán Isabel de la Cerda also known as Isabel de la Cerda Pérez de Guzmán (Seville c.1329 - after 1383 was the only surviving daughter of Luis de la Cerda and his first...

, married Bernardo de Bearne, first Count of Medinaceli
Duke of Medinaceli
Duke of Medinaceli is a Spanish noble title given to Luis de la Cerda y de la Vega on 31 October 1479, by the Catholic Monarchs, Isabella I of Castile and Ferdinand II of Aragon when the old title of Count of Medinaceli, awarded to his grandfather, Bernal de Foix, in 1368, whereby was transformed...

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