Leo canonized Carlo Acutis, who passed away in 2006, during an outdoor Mass in St. Peter’s Square on Sunday, attended by an estimated 80,000 individuals, which included numerous millennials and families with young children.

During the first saint-making Mass of his pontificate, Leo also canonised another popular Italian figure who died young, Pier Giorgio Frassati.

“He serves as a symbol or model of how Catholics should engage with the digital realm—with discipline and a concentration on timeless Catholic spirituality,” the Pope stated.

“He is a new saint of simplicity for the ever complex digital landscape of contemporary Catholicism.”

Frassati, the other saint being canonised on Sunday, lived from 1901-1925, when he died at age 24 of polio.

Carlo was born into a notable Turin family but is recognized for his commitment to aiding the poor and performing charitable acts while sharing his faith with peers.