The canonisation of the first Catholic saint of the millennial generation, Carlo Acutis, and an Italian Catholic activist Pier Giorgio Frassati is set to take place in St Peter's Square in Vatican City.
The canonisation of Carlo Acutis, who died of leukemia in 2006 aged 15, was initially set for April but postponed when Pope Francis died, and will be watched by faithful on giant screens in Assisi, a medieval city and pilgrimage site in the central region of Umbria.
Dubbed 'God's Influencer' for his efforts to spread the Catholic faith online, the ceremony is expected to draw thousands of pilgrims.
A fan of video games, Carlo taught himself basic coding and used it to document miracles and other elements of the Catholic faith online.
The Vatican has recognised Carlo as performing two miracles himself - a necessary step on the path to sainthood.
The first was the healing of a Brazilian child suffering from a rare pancreatic malformation, the second the recovery of a Costa Rican student seriously injured in an accident.
In both cases, relatives had prayed for help from the teenager, who was beatified in 2020 by Pope Francis.
Pier Giorgio Frassati, who died of polio in 1925 aged 24, was known for helping those in need.
His first recognised miracle took place in 1933, involving the healing of a man suffering from Pott’s disease.
His second was in 2017 in the United States, with a seminarian’s ruptured achilles tendon being healed after praying to Pier Giorgio.
Canonisation is the result of a long and meticulous process, involving an investigation by the Vatican and specialists who assess whether the obligatory miracles have taken place. Final approval rests with the pope.
The ceremony will be Pope Leo XIV's first since his election in May.
The Bishop of Cork and Ross, Fr Fintan Gavin, said he was looking forward to the event.
"The lives of Blessed Carlo Acutis and Blessed Pier Giorgio Frassati send a powerful message to young people in our parishes, schools, colleges and those entering the workplace - that true happiness is not only possible today, but is also deeply attractive."
