Leo XIV, the first ever American pope, condemned the exploitation of the poor and called for unity in the church during his inaugural Mass in St. Peter’s Square, an event attended by world leaders, royalty and tens of thousands of believers.

Pope Leo XIV spoke on Sunday of the remarkable times during which he's been elevated to the papacy, saying during his first homily as pontiff that he will rise to the task "with fear and trembling," while still seeing to serve all with "faith and joy.