English: St. Paul’s Church (Great Basilica). The building reflects all the elements of basilical plan and consists of three naves and a semicircular apse. The exterior surface of the apse is encircled with a hexagonal wall. The apse has a diameter of 10,8 m and a depth of 9,2 m. The central nave is separated from the narrow naves on the sides by two rows of columns each having 13 columns and these columns test on hexagonal bases. The 27 x 13 m narthex (entrance) on the west of the building, which measures 70 x 27 m, lies in the east west direction and leans on the city walls. The ground of the central nave is composed of red, yellow, white and black tesserae and is covered with a mosaic decorated with geometric and floral motifs. The name of Archbishop Optimus, represented Antiocheia in the Council of Constantinople in 381 AD and one of the founders of Orthodoxy takes place in an inscription on the mosaic in front of the apse. This name forms a basis for dating the building construction to the late 4th century AD. This date is the beginning date for the monumental churches in Anatolia. The Great Basilica of Antiocheia is one of the two earliest example of Early Christian churches. The church visible today is the 5th – 6th century AD church, which was a restored version from the late 4th century AD and placed on the 1st floor of the church of Optimus. St. Paul, regarded as the most famous and efficient missionary of Early Christianity together with St. Pierre, had three visits to Antiocheai between the years 46-62 AD and preached in the synagogue under the foundations of the current church. He announced Christianity to the world from here. In his preaching in the synagogue on the Sabbath he read texts from Holy Law and writings of the prophet. This is considered as St. Paul’s first preaching as a missionary. On the picture: The semicircular apse of the basilica, situated at its east side. It is encircled by an exterior hexagonal wall.