“It’s like I can maybe not be as great as Carlo may be, but I can be looking after him and be like, ‘What would Carlo do?’” said Leo Kowalsky, an 8th grader at a Chicago school attached to the Blessed Carlo Acutis Parish.

Kowalsky said he was particularly excited that his own namesake – Pope Leo – would be canonizing the patron of his school. “It’s kind of all mashed up into one thing, so it is a joy to be a part of,” Kowalsky said in an interview last week.

Much of Acutis’ popularity is thanks to a concerted campaign by the Vatican to give the next generation of faithful a “saint next door” who was ordinary but did extraordinary things in life. In Acutis, they found a relatable tech-savvy millennial – the term used to describe a person born roughly between 1981 and 1996 who was the first generation to reach adulthood in the new millennium.

The Vatican said 36 cardinals, 270 bishops and hundreds of priests had signed up to celebrate the Mass along with Leo in a sign of the saints’ enormous appeal to the hierarchy and ordinary faithful alike.

An hour before the Mass, St. Peter’s Square was already full with pilgrims, many of them young millennial Italians, many with toddlers in strollers.

“I learned from different people what his professors, his teachers said about his joy and the light he carried around him,” said Leopoldo Antimi, a 27-year-old Roman who got to the square early to secure a spot. “So for me personally as an Italian, even on social networks that are used so much, it is important to have him as an influencer.”

Matthew Schmalz, professor of religious studies at Holy Cross college in Worcester, Massachusetts, said Acutis’ canonization extends the church tradition of popular piety to the digital age.

“He becomes an emblem or model of how Catholics should approach and use the digital world–with discipline and with a focus on traditional Catholic spirituality that defies the passage of time,” he said in statement. “He is a new saint of simplicity for the ever complex digital landscape of contemporary Catholicism.”

Frassati, the other saint being canonized Sunday, lived from 1901-1925, when he died at age 24 of polio. He was born into a prominent Turin family but is known for his devotion to serving the poor and carrying out acts of charity while spreading his faith to his friends.