Religious nepotism under Sigismund and in the years following his death was undoubtedly apparent – three of his sons, John Casimir, John Albert and Charles Ferdinand, were ordained as priests and held notable posts. Charles was appointed the bishop of Wrocław in 1625 and bishop of Płock in 1640. John Albert became bishop of Warmia at the age of nine in 1621 and cardinal-bishop of Kraków at the age of twenty in 1632. John Casimir, prior to his election to the throne, was made a cardinal at the behest of Pope Innocent X.