After the Byzantine Baths stand the ruins of the Double Church which includes the Haghia Maria Church whereb the Ecumenical Council of 431 A.D. was held and another Council in 449 (annulled by the Pope), also known as the "robbery of Ephesus” as much violence occurred there. This Church was built in the IVth cent. A.D. on the site of an earlier Roman building, and dedicated to the Virgin.
The basic in the Baptistry was so large as at that time, baptism was still effected using full immersion. Later on,a second Church was built next to the first, and hence its name, the "Double Church”; it is hard, homever, to make out the ruins of each one separately.
Patriarch of Istanbul, Nestor, had declared that the nature of Jesus Christ was none more than that of a highly evolved man of culture, when he was excommunicated, the Council of 430 was called during which, inside the Double Church, the exxlesiastical authorities officially recognised the divine nature of Christ.
The Church was also used as a school for initiates training to be Priests of Ephesus. On the 26th July 1967, Pope Paul VIth visited the Double Church and in memory of the prayer he recited beneath the Crucifx, there is a marble plaque bearing the following inscription "SUMMUS PONTIFEX PAULUS SEXTUS IN HINC SACRA SEDE PRECES EFFUXIT DIE XXVI JULIUS MCMLXVII”