Archaeology
In 1972, Bellarmino Bagatti, a franciscan friar and archaeologist, excavated the site and found evidence of an ancient cemetery dating to the 1st century; his findings have not yet been subject to peer review by the wider archaeological community, and the validity of his dating has not been fully assessed.
Bagatti interpreted the remains to indicate that the cemetery's initial structure consisted of three chambers (the actual tomb being the inner chamber of the whole complex), was adjudged in accordance with the customs of that period. Later, the tomb interpreted by the local Christians to be that of Mary's was isolated from the rest of the necropolis, by cutting the surrounding rock face away from it. An edicule was built on the tomb.
A small upper church on an octagonal footing was built by Patriarch Juvenal (during Marcian's rule) over the location in the 5th century, and was destroyed in the Persian invasion of 614. During the following centuries the church was destroyed and rebuilt many times, but the crypt was left untouched, as for the Muslims it is the burial place of the mother of prophet Isa. It was rebuilt then in 1130 by the Crusaders, who installed a walled Benedictine monastery, the Abbey of St. Mary of the Valley of Jehoshaphat. The monastic complex included early Gothic columns, red-on-green frescoes, and three towers for protection. The staircase and entrance were also part of the Crusaders' church. This church was destroyed by Saladin in 1187, but the crypt was still respected; all that was left was the south entrance and staircase, the masonry of the upper church being used to build the walls of Jerusalem. In the second half of the 14th century Franciscan friars rebuilt the church once more. The Greek Orthodox clergy launched a Palm Sunday takeover of various Holy Land sites, including this one, in 1757 and expelled the Franciscans. The Ottomans supported this "status quo" in the courts. Since then, the tomb has been owned by the Greek Orthodox Church, while the grotto of Gethemane has still been possessed by Franciscans.
Read more about this topic: Mary's Tomb