An Italian teenager, Carlo Acutis, known as "God's Influencer" and "cyber-apostle," is set to become the Catholic Church's first millennial saint. He will be canonized by Pope Leo XIV on Sunday at the Vatican, with tens of thousands of pilgrims expected to attend.

• Acutis died of leukaemia in 2006 at the age of 15.

• The canonization ceremony will be conducted by Pope Leo XIV, making it his first such ceremony.

• Acutis's body, dressed in jeans and Nike trainers, is preserved in a glass-walled tomb in Assisi, visited by hundreds of thousands annually.

• He used his self-taught coding skills to document miracles and Catholic faith online, despite his parents not being particularly devout.

• The Vatican recognized two miracles attributed to Acutis—the healing of a Brazilian child and the recovery of a Costa Rican student—as steps towards his sainthood.