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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.
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.