Church of the Holy Sepulchre

One of the altars at Calvary.

On the east side opposite the Rotunda is the Crusader structure housing the main altar of the Church, today the Greek Orthodox catholicon. The second, smaller dome sits directly over the center of the transept crossing of the choir where the compas, an omphalos once thought to be the center of the world, is situated. East of this is a large iconostasis demarcating the Greek Orthodox sanctuary before which is set the Patriarchal throne and a throne for visiting episcopal celebrants. On the south side of the altar via the ambulatory is a stairway climbing to the Chapel of Calvary, or Golgotha, believed to be the site of Jesus' crucifixion and the most lavishly decorated part of the church. The main altar there belongs to the Greek Orthodox, while the Roman Catholics have an altar to the side. Further to the east in the ambulatory are the stairs descending to the Chapel of St. Helena, belonging to the Armenians. From there, another set of stairs leads down to the Roman Catholic Chapel of the Invention of the Holy Cross, believed to be the place where the True Cross was found.