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When did Giovanni deā Medici become a cardinal deacon?
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Leo X
Pope Leo X, contemporary medallion; in the coin collection of the Vatican Library.
Giovanni deā Medici, who later became Pope Leo X, was named cardinal deacon of the church of Santa Maria in Domnica at the age of 13.1
Although he received this appointment at 13, he was subject to a stipulation that prevented him from assuming the insignia of his rank or joining the Sacred College of Cardinals for three years. He officially became a member of the College of Cardinals in 1492.1