Pope Leo XIV proclaimed a 15-year-old computer genius the Catholic Church’s first millennial saint, along with another popular Italian figure who spent his life spreading his faith before dying at a young age.

Leo canonized Carlo Acutis, who died of Leukemia in 2006, and Italian student and avid outdoorsman Pier Giorgio Frassati, who died in his early 20s of polio in 1925, during an open-air Mass in St. Peter’s Square before an estimated 80,000 people.

Leo said both saints created “masterpieces” out of their lives by dedicating them to God.

“The greatest risk in life is to waste it outside of God’s plan,” Leo said in his Sunday homily. The new saints “are an invitation to all of us, especially young people, not to squander our lives, but to direct them upwards and make them masterpieces.”

Frassati, the other saint canonized, was a “beacon for lay spirituality,” Leo said.

Frassati lived his faith through “constant, humble, mostly hidden service to the poorest of Turin,” noted the Frassati Catholic Academy. “He lived simply and gave away food, money or anything that anyone asked of him.” 

It is believed that he contracted polio from those he ministered to in the slums of Turin, Italy, before his death.

Fox News Digital’s Ashley J. DiMella and the Associated Press contributed to this report.