On Thursday, Pope Leo XIV, the first American, was elected as the new pope. Here's how world leaders are reacting:

Presidents, prime ministers and royalty were among those present in St. Peter’s Square on Sunday morning for Pope Leo XIV’s inaugural Mass, a service that marks the official start of his pontificate. Here are some of the world leaders who have flown to Rome to attend the Mass that installs Pope Leo as the leader of 1.4 billion Roman Catholics.

Pope Leo XIV was introduced Thursday, sending shockwaves through the world as he's the first American pope, from Chicago, and an underdog in the election.