Alfonso was the first son of Pedro de Ulloa y Fonesca and Isabel de Quijada. On 29 January 1469, in recognition of his services to the Spanish crown, Alfonso was appointed by the King of Spain and confirmed by
Pope Paul II as
Bishop of Ávila. On 25 February 1470, he was ordained bishop by
Giacopo Antonio Venier,
Bishop of Cuenca;
Giovanni Gianderoni,
Bishop of Città di Castello; and
Corrado Marcellini,
Bishop of Montefeltro. On 26 August 1485, he was appointed by
Pope Innocent VIII as
Bishop of Cuenca. On 24 May 1493, he was appointed by
Pope Alexander VI as
Bishop of Osma, where he served until his death in 1505. == References ==