Pope Francis has officially been installed as the head of the Roman Catholic Church during an inaugural Mass in St. Peter's Square. Tens of thousands were on hand for the history-making event, including six heads of state, Vice President Joe Biden, and leaders of more than 30 other faiths. 

Among them was Ecumenical Patriarch Bartholomew from Istanbul. He's the first spiritual head of Orthodox Christians to attend a Roman Pope's inaugural Mass since western and eastern Christianity split in 1054.

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