He then found work in the chancery of Pope Nicholas V, but with several other humanists, he left after the accession of Pope Callixtus III and travelled instead to the Neapolitan court of Alfonso the Great of Aragon.
Through his excellent relations with Pope Callixtus III, he had Prince-Bishop John of Heinsberg deposed, and replaced by his 18-year-old nephew Louis de Bourbon.
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In the Church of San Nicolás, of which the Pope Callixtus III was rector before becoming Pope, in the door that overlooks to the square of San Nicolás, is remembered with tiles the prediction of Saint Vincent Ferrer according to which Alfonso de Borja would become Pope and then will canonize him.