Up to a million young Catholic believers are expected Saturday for a night-time vigil led by Pope Leo XIV, the culmination of a week-long pilgrimage, a key event in the Jubilee holy year.The "Jubilee of Youth" -- when the Vatican invites Catholics aged 18 to 35 to the seat of the global Church's power -- has seen thousands of young pilgrims from around the world flood Rome this week.

Pope Leo XIV on Tuesday received a rock star's welcome at the Vatican's festival of Catholic influencers — priests, nuns and ordinary faithful who use their social media presence to preach and teach the faith — as he urged them to ensure that human relations don’t suffer with the spread of digital ecosystems and artificial intelligence.