Pope John Paul II proclaimed the day as the first-ever World Youth Day.
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Pope Constantine died.
The Trevi Fountain, one of Rome's most famous landmarks, was opened to the public by Pope Clement XIII.
Pope Francis blamed Global warming on 'human selfishness.'
Over 4 million people pay their last respects to Pope John Paul II.
Pope Clement VII excommunicated King Henry VIII of England for his terrible behavior.
