Pope Leo XIV is set to create seven new saints Sunday, including the first from Papua New Guinea, an archbishop killed in the Armenian genocide and a Venezuelan "doctor of the poor".

Also set to be canonised in the solemn ceremony in St Peter's Square on World Mission Day are three nuns who dedicated their lives to the poor and sick, and former Satanic priest Bartolo Longo.

Born in 1841, the Italian lawyer subsequently rejoined the Catholic faith and went on to found the Pontifical Shrine of the Blessed Virgin of the Rosary of Pompeii.

The canonisation will be the second for the US pope since he was made leader of the Catholic Church on May 8.

Last month, he proclaimed as saints Italians Carlo Acutis -- a teenager dubbed "God's Influencer" who spread the faith online before his death a

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