Carlo Acutis, ‘God’s influencer’ who died age 15, declared a saint by Pope Leo

London-born Italian, who died in 2006, built websites to spread Catholic teaching and is credited with two miracles

A London-born Italian teenage computer whiz who died in 2006 age 15, has been declared the Catholic church's first millennial saint during an open-air mass in a packed St Peter's Square.

Carlo Acutis, who died of leukaemia, built multilingual websites to spread Catholic teaching, later earning him the nickname God's influencer". He was canonised by Pope Leo XIV alongside Pier Giorgio Frassati, another young Catholic activist, who died a century ago.