[1] He was a familiar of Cardinal Roderic Llançol i de Borja, who later became Pope Alexander VI.

[1] Pope Sixtus IV confirmed his election on March 20, 1479, and Castro subsequently occupied this see until his death.

[1] Following the papal conclave of 1492, the new pope, Alexander VI, made Castro prefect of the Castel Sant'Angelo.

[1] From the time of his promotion to the cardinalate, he lived in Rome permanently, participating in the ceremonies, consistories and religious feasts and celebrating masses; he was the executor of the will of Cardinal Bartolomé Martí.

[1] In 1506, he became the Apostolic Administrator of Malta, although Ferdinand II had requested that bishopric for another cardinal who succeeded in the same year.