Alfonso de Fonseca (1422–1505) was a Roman Catholic prelate who served as Bishop of Osma (1493–1505), Bishop of Cuenca (1485–1493),[3] and Bishop of Ávila (1469–1485).
[4] Alfonso was the first son of Pedro de Ulloa y Fonesca and Isabel de Quijada.
[2] On 29 January 1469, in order to thank his services to the Spanish crown,[1] Alfonso was appointed by the King of Spain and confirmed by Pope Paul II as Bishop of Ávila.
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.