The excavations conducted in 1935 by A. M. Scheinder of the German Institute of Archeology in Istanbul revealed that the excavation was carried out at the level of 2.00 m. and the frieze fragments decorated with lamb reliefs representing the Twelve Apostles and the columns belonging to the Propylon (monumental gate) of the building. In addition, other architectural pieces belonging to the monumental entrance can be seen in the garden in the western part. Today's Hagia Sophia was built by Emperor Justinianos (527-565), the two important architects of the period, Miletos (Miletus) Isidoros and Trallesli (Aydin) Anthemios. According to historian Prokopios, the building, which started in 23 February 532, was completed in a short period of 5 years and the church was opened for worship on 27 December 537. In the sources, the opening day of the Hagia Sophia, the Emperor Justinianos, enter into the temple, "Thank God for giving me the opportunity to make such a place of worship," he said, then Hz. He was crying out, saying, seni O Solomon, I have passed you.
Innovation in the architecture of the Third Hagia Sophia is the combination of the traditional basilical plan and the central domed plan. The structure has three nefi, an apse, inner and outer narteksi. Length from the apse to the outer narthex 100 m. width is 69.50 m. The height of the dome from the ground is 55.60 m and its diameter is 31.87 m in the north-south direction and 30.86 m in the east-west direction.