Watch ABC News coverage of the inaugural Mass of Pope Francis on Tuesday, March 19, beginning at 12:50 a.m. PT.
Francis will be officially installed Tuesday as the 266th pope of the Roman Catholic Church, its first non-European in 1,300 years.
The Vatican on Monday released details of the Mass, saying it would be a simplified version of the 2005 installation Mass that brought Pope Benedict XVI to the papacy, with many gestures to Eastern rite Catholics and Orthodox Christians in a sign of church unity.
The Vatican also released details of Francis' coat of arms and official ring, both of which are in keeping with his simple style and harking back to popes past: The coat of arms is the same Jesuit-inspired one he used as archbishop of Buenos Aires, while the ring was once offered to Pope Paul VI, who presided over the second half of the Second Vatican Council, the church meetings that modernized the church.
Francis will officially receive the ring and the pallium, a wool stole, during Tuesday's installation Mass, which is drawing six sovereign rulers, 31 heads of state, three princes and 11 heads of government to the Vatican.