Juan Manuel (1234 – 25 December, 1283, sometimes called only Manuel) was the son of Ferdinand III of Castile and his wife Elisabeth of Hohenstaufen.
He was born at Carrión de los Condes. The name Manuel was given to him to commemorate his maternal grandmother's roots in Imperial Byzantium. Juan Manuel travelled to Italy in 1259 as part of the embassy send by his father to Pope Alexander IV.
He was Lord of Escalona, Peñafiel and Villena.
He died at Peñafiel in 1283 and was buried in the Monastery of Uclés. His son Juan Manuel, who succeeded him in Peñafiel and Villena among the others, was a notable medieval writer.
He married twice. His first wife, whom he married in 1260 in Soria was Constance of Aragon (1239-1269?), daughter of James I of Aragon. Two children were born of this marriage:
His second marriage after Constança's death was in 1274/1275 to Beatrice of Savoy (d. 23 February 1292), daughter of Amadeus IV of Savoy. One child was born of this marriage:
Children from other women include: