An Italian teenager dubbed "God's Influencer" for his efforts to spread the Catholic faith online will become the first millennial saint Sunday at a canonisation attended by thousands of pilgrims.

Computer whiz Carlo Acutis, who died of leukemia in 2006 aged 15, will be raised to sainthood by Pope Leo XIV in a solemn ceremony in St Peter's Square at the Vatican.

The teenager's body, dressed in jeans and a pair of Nike trainers, lies in a glass-walled tomb in Assisi, visited by hundreds of thousands of people a year.

His canonisation, initially set for April but postponed when Pope Francis died, will be watched by faithful on giant screens in Assisi, a medieval city and pilgrimage site in the central region of Umbria.

Acutis, born in London in 1991, had an ardent faith, though his paren

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