The construction and dedication of Marian churches often symbolizes the Mariological trends within a period such as a papal reign. For instance, the 1955 rededication of the church of Saint James the Great in Montreal with the new title Mary, Queen of the World Cathedral by Pope Pius XII was a reflection of the fact that he was called the most Marian pope. Indeed, just a year earlier, Pope Pius XII had proclaimed that title for the Virgin Mary in his 1954 encyclical Ad Caeli Reginam. This encyclical on the Queenship of Mary is also a good example of how the interplay between Churches and Marian art reinforces the effect of Marian devotions, as discussed below.