Alonso III de Fonseca

Alonso III Fonseca (Santiago de Compostela, 1475–1534) was a Galician archbishop and politician. He was archbishop of Santiago de Compostela from 1507, and archbishop of Toledo from 1523. He was a major supporter of the University of Santiago de Compostela. He was the son of the archbishop Alonso II Fonseca and Alonso II's concubine María de Ulloa.

His older brother was Diego II de Acevedo, first Count of Andrade. They had different surnames because a younger son (i.e. Alonso III Fonseca) would take the surname of his father (“Fonseca”) and the older son would take the name of his grandmother (the mother of his father the archbishop), which was “Acevedo.”

As archbishop, he was forced to confront Condado de Altamira, Count of Altamira (), because the count was meddling in the affairs of the Tierras de Santiago, and also put a stop to the injustices committed by the governors there, taking advantage of his close relations with the Spanish monarchy as well as the papacy. He was also involved in lawsuits against the Benedictine monks of San Martín Pinario, during a resurgence of this religious order in Galicia.

He presided over his father’s funeral in 1512, at which Gonzalo Fernández de Córdoba, known as "The Great Captain", attended, and Fernández de Córdoba symbolically offered his weapons to Saint James the Great (Santiago) at the funeral.

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