The Basilica of St. John () was a basilica in Ephesus. It was constructed by Justinian I in the 6th century. It stands over the believed burial site of John the Apostle. It was modeled after the now lost Church of the Holy Apostles in Constantinople. The basilica is on the slopes of Ayasuluk Hill, right next to the İsa Bey Mosque, just below the fortress near the center of Selçuk, İzmir Province, Turkey and about from Ephesus. History Justinian's Church Little is known about the Basilica of St. John, with its only source being from a small description provided by Procopius in one of his works, Buildings, whereupon he writes: There chanced to be a certain place before the city of Ephesus, lying on a steep slope hilly and bare of soil and incapable of producing crops, even should one attempt to cultivate them, but altogether hard and rough. On that site the natives had set up a church in early times to the Apostle John; this Apostle has been named “the Theologian,” because the nature of God was described by him in a manner beyond the unaided power of man. This church, which was small and in a ruined condition because of its great age, the Emperor Justinian tore down to the ground and replaced by a church so large and beautiful, that, to speak briefly, it resembles very closely in all respects, and is a rival to, the shrine which is dedicated to all the Apostles in the imperial city... Construction of the church began by 548 and was completed by 565. The building of this church was presided over by the bishop, Hypatius of Ephesus. As the leading ecclesiastical theoretician and writer of his day, it was possible that he gained the influence of Justinian and had the tomb of St. John reconstructed, as major construction in the Asia Minor was rare. After its completion, it was regarded as one of the holiest churches of its time and was held in great honor, as Procopius notes in his Secret History: ...to the sanctuary of the Apostle John, which was the most holy one there and held in very high honour... Despite its popularity after the 9th century it was no longer mentioned, possibly due to a new church built in honor of St. John, Church of John the Theologian. Design Materials The basilica was built almost