Teodoro Paleologo di Montferrato was born in Casale Monferrato on 14 August 1425, the son of John Jacob, Marquess of Montferrat, and Princess Giovanna of Savoy, the daughter of Amadeus VII, Count of Savoy and sister of Antipope Felix V.[1] In his early career, he was a protonotary apostolic and served as dean of the cathedral church of Santa Maria di Saluzzo in Saluzzo.
[1][2] He arrived in Rome on 21 April 1468, and received the red hat in a public consistory.
[1] He returned to Rome to participate in the papal conclave of 1471 that elected Pope Sixtus IV.
[1] In 1475, he was elected Bishop of Casale and subsequently held this office until 1481.
[1] He died in Asti on 24 January 1481 after a minor injury became infected.