Pope Leo XIV called for a “united Church” in his inauguration homily from St. Peter’s Square where approximately 100,000 people had gathered at the start of the Mass, according to authorities.

Pope Leo XIV waves to crowds while riding the "Popemobile" ahead of his inaugural Mass as leader of the Catholic Church.

VATICAN CITY (AP) — Pope Leo XIV took his first popemobile ride through St. Peter’s Square ahead of his installation on Sunday, waving from the back of the open-back truck to the crowd waving flags and cheering “Viva il Papa!”

Chicago-born Pope Leo XIV will officially begin his papacy this morning as he presides over his inaugural Mass in St. Peter’s Square at the Vatican.

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Pope Leo XIV officially opened his pontificate as history’s first American pope on Sunday, presiding over an inaugural Mass in St. Peter’s Square before tens of thousands of people, presidents, patriarchs and princes in a ceremony that blended ancient ritual,