The Basilica di Santa Maria Maggiore is a Papal major basilica and the largest Catholic Marian church in Rome from which size it receives the appellation "major". Among the Patriarchal Basilicas of Rome, St. Mary Major is the only one to have kept its original structure, though it has been enhanced over the course of years. The basilica enshrines the venerated image of Salus Populi Romani, depicting the Blessed Virgin Mary as the help and protectress of the Roman people, which was granted a Canonical coronation by Pope Gregory XVI on 15 August 1838 accompanied by his Papal bull Cælestis Regina.