Millennial saint Carlo Acutis has a surprising connection to two other saints within the Catholic church - and family ties to a pioneering Italian mathematician.

British-born Carlo was to be canonised on September 7 after the Vatican recognised him as having performed two miracles since his death in 2006.

Ahead of the ceremony in St Peter's Square at the Vatican, Acutis' mother told The Times of her son's connections through history on both sides of the family.

Antonia Salzano Acutis, 58, said that, on her side, her son was related to Giulia Salzano and Caterina Volpicelli, both saints giving the family a place in the church.

On his father's side, computer whiz Carlo was related to Paolo Ruffini, an 18th century Italian mathematician who made significant contributions to the field of algebra.