By Joshua McElwee

VATICAN CITY (Reuters) -A British-born Italian boy who died of leukaemia in 2006 will become the first Catholic saint of the millennial generation on Sunday, in a ceremony led by Pope Leo in St. Peter's Square that is expected to attract tens of thousands of worshippers.

Carlo Acutis, who died aged 15, learned computer code to build websites to spread his faith. His story has drawn wide attention from Catholic youth, and he will now be elevated to the same level as Mother Teresa and Francis of Assisi.

Sunday's ceremony was originally set for April but was postponed after the death of Pope Francis. Leo, elected in May to replace Francis, will now preside at such an event for the first time.

Leo will also canonize Pier Giorgio Frassati, a young Italian man who was known

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