After Diocletian reorganized the region in 295, Sardis became the capital of the district of Lydia, the seat of the governor and metropolitan archbishop.2
There is only one known epigraphic reference to the see of Sardis, published in the 5th or 6th century.3 A 1959 landslide revealed several ecclesiastical artifacts and a throne that archaeologists postulated may have been used by the bishops of Sardis.4 The first systemic investigation of the ruins of Sardis came in 1910 with an expedition from Princeton University.1 Excavations in 1912 revealed a small "Church M", containing coins which were dated to the 5th century and an apse overhanging one of the earliest known Christian altars, near the north eastern corner of the Temple of Artemis.1
According to the Menologion, Clement, a disciple of Paul of Tarsus and one of the Seventy (Philippians 4:3), was the first bishop of Sardis.1 Little is known about the ancient episcopacy of Sardis, with the notable exception of Saint Melito, a contemporary of Marcus Aurelius from the 2nd century,5 whom some sources refer to as the second bishop of Sardis6—citing the "improbability of seventy years in the episcopate"7—making him the successor to the "angel of the church of Sardis" referenced in the New Testament (Rev. 3:1-3), while other sources regard Melito himself as the "apostle" or "angel of the church of Sardis."8 In the Book of Revelation, Saint John writes a letter to the church of Sardis, reproaching it and its bishop.9
The Council of Rimini desposed Bishop Hortasius of Sardis in 359 because he had been ordained without the saction of the bishops of Lydia.10 The See had 27 suffragan bishops (including the bishop of Thyatira11 and Philadelphia1213) in the 7th century, and approximately that number until the end of the 10th century.9
Arabs sacked Sardis in 716, but the city remained a part of a resurgent Roman (Byzantine) Empire until the aftermath of the battle of Manzikert in 1071. Euthymius, a Metropolitan Bishop of Sardis, was martyred in 824 in relation to iconoclasm.14
The Metropolitan of Sardis, which had once ranked sixth in precedence in the Eastern church,9 continued to be appointed into the 13th century, long after Sardis had shrunk into a village which was no longer a regional locus of power.16 In 1369, Philadelphia replaced Sardis as the site of the metropolitan bishop,9 Sardis having been suppressed by the Patriarch of Constantinople,17 and Roman Catholic archbishops of Sardis began to be consecrated in partibus infidelium (in a diocese which had fallen into the power of infidels) until 1882, when the were instead called titular archbishops.918
Dionysius, the Metropolitan of Sardis in 1438, died during the Council of Florence and thus was not made to sign its decree.19
One of the first scholarly listings of the bishops of Sardis is given by Michel Le Quien in Oriens christianus in quatuor patriarchatus digestus, in quo exhibentur Ecclesiae patriarchae caeterique praesules totius Orientis (abbreviated Oriens Christ.), published posthumously in 1740.9
^ abcde Otto F. A. Meinardus. 1974. "The Christian Remains of the Seven Churches of the Apocalypse." The Biblical Acheaologist. Vol. 37, No. 3. p. 78–80.
^ W.H. Buckler and David M. Robinson (eds.). 1932. Sardis, Vol. VII, Part 1, Greek and Latin Inscriptions. Publications of the American Society for the Excavation of Sardis. p. 190.
^The New York Times. 1859, October 26. "Landslide yields Lydian artifacts." p. 3.
^ Ernest Cushing Richardson et al. 1886. The Ante-Nicene Fathers: Translations of the Writings of the Fathers Down to A.D. 325. C. Scribner's Sons, p. 750.
^ Jeremy Taylor and Reginald Heber, 1828. The whole works of the Right Rev. Jeremy Taylor, D.D. Lord Bishop of Down, Connor, and Dromore: with A Life of the Author, and a critical examination of his writings by the Right Rev. Reginald Heber, D.D. late Lord Bishop of Calcutta. Reginald Heber. p. 35.