In 325/6 C.E. Constantine excavated the mount opposite the ruins of the temple said to be the site of Christ's death and resurrection.
In a letter to Macarius, the bishop of Jerusalem, Constantine instructed that a basilica more wonderful than any other should be constructed here, on the site of the Passion of the Lord.Eusebius describes, in a style akin to the description of Solomon's temple, the construction and beauty of this basilica and the associated buildings.
Two plans of the Martyrium-Sepulchre complex are reproduced below. The top one is based upon the description provided by Eusebius. The second upon recent archaeological excavations.