Roman Catholic cardinals will begin the task of electing a new pope, locking themselves away from the world until they choose the man they hope can unite a diverse but divided global Church.

Cardinals entered St. Peter’s Basilica on Wednesday for a final Mass before the conclave to elect the successor to Pope Francis after his death last month.

The cardinals have gathered in Vatican City to choose the 267th pope. St Peter, regarded as the first pope, was elected around 30AD. In the morning, cardinals will take part in a mass in St Peter’s Basilica. Later, in the afternoon, the cardinals will walk in a procession along the Via delle Fondamenta to the Sistine Chapel.