Pope Alexander VI, born Rodrigo de Borja became Pope.
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Mother Teresa was declared a saint by Pope Francis during a ceremony at the Vatican.
Pope Anastasius I became the Bishop of Rome, reigning until his death.
Pope Gregory XIII introduced the concept of the Gregorian Calendar to Europe.
Pope Celestine V resigned after just five months in the job to return to his life as an ascetic hermit.
Pope Paul VI canonized Elizabeth Anne Seton as the first American saint.
