The Feast of the Assumption

The Catholic doctrine of the Assumption of Mary into Heaven states that Mary was transported into Heaven with her body and soul united. Although the Assumption was only officially declared a dogma by Pope Pius XII in his Apostolic Constitution Munificentissimus Deus in 1950, its roots in Catholic culture and art go back many centuries. While Pope Pius XII deliberately left open the question of whether Mary died before her Assumption, the more common teaching of the early Fathers is that she did.[24][25]
An early supporter of the Assumption was Saint John of Damascus (676-794), a Doctor of the Church who is often called the Doctor of the Assumption.[26] Saint John was not only interested in the Assumption, but also supported the use of holy images in response to the edict by the Byzantine Emperor Leo III, banning the worship or exhibition of holy images.[27] He wrote: "On this day the sacred and life-filled ark of the living God, she who conceived her Creator in her womb, rests in the Temple of the Lord that is not made with hands. David, her ancestor, leaps, and with him the angels lead the dance."
The Eastern Church held the feast of the Assumption as early as the second half of the sixth century, and Pope Sergius I (687-701) ordered its observance in Rome.[28]
The Orthodox tradition is clear that Mary died normally, before being bodily assumed. The Orthodox term for the death is the Dormition of the Virgin. Byzantine depictions of this were the basis for Western images, the subject being known as the Death of the Virgin in the West. As the nature of the Assumption became controversial during the High Middle Ages, the subject was often avoided, but depiction continued to be common until the Reformation. The last major Catholic depiction is Caravaggio's Death of the Virgin of 1606.
Meanwhile depictions of the Assumption had been becoming more frequent during the late Middle Ages, with the Gothic Siennese school a particular source. By the 16th century they had become the norm, initially in Italy, and then elsewhere. They were sometimes combined with the Coronation of the Virgin, as the Trinity waited in the clouds. The subject was very suited to Baroque treatment.