Alonso de Fonseca y Ulloa

Alonso de Fonseca y Ulloa (also Alonso I de Fonseca)(died 1473) was a Roman Catholic prelate who served as Archbishop of Seville (1454-1465 and 1469-1473), Archbishop of Santiago de Compostela (1465-1469), and Bishop of Ávila (1545-1454).

In 1445, Alonso de Fonseca y Ulloa was appointed by the King of Spain and confirmed by Pope Eugene IV as Bishop of Ávila. On 4 Feb 1454, he was appointed by Pope Nicholas V as Archbishop of Seville. In 1465, he was appointed by Pope Paul II as Archbishop of Santiago de Compostela. In 1469, he was appointed by Pope Paul II to his prior position as Archbishop of Seville where he served until his death in 1473. While bishop, he was the principal consecrator of Pedro González de Mendoza, Bishop of Calahorra y La Calzada (1454).