The Infante Ferdinand (Portuguese pronunciation: [fɨɾˈnɐ̃du]; English: Ferdinand; September 29, 1402-June 5, 1443), commonly known as the Saint Prince (Portuguese: Infante Santo; more correctly translated as the Holy Prince,) was an infante (prince) of Portugal of the House of Aviz. Fernando was the sixth son of King John I of Portugal and his wife Philippa of Lancaster. Ferdinand soon became interested in religious questions and, still young, he was ordered Grand Master of the Order of Aviz by his father. He was offered the office of Cardinal by Pope Eugene IV.