Diocese of Arcadiopolis

The Diocese of Arcadiopolis (modern Lüleburgaz in European Turkey) was an ecclesiastical diocese established in the 5th century and extant until the 14th century.

The see is first mentioned in the Council of Ephesus in 431, when Bishop Euprepius held the joint episcopacy of Bizye and Arcadiopolis. The same arrangement is attested in the Council of Chalcedon in 451. The two cities probably did not become separate bishoprics until the end of the century. Arcadiopolis was originally a suffragan of Heraclea in Europa, metropolitan see and capital of the Roman province of Europa, but became an autocephalous archbishopric by the late 9th century, and eventually a metropolitan see probably during the reign of Isaac II Angelos (r. 1185–95). Of its bishops, Lucianus was at the Council of Chalcedon (451), Sabbatius at the Second Council of Constantinople (553), John at the Second Council of Nicaea (787), and Basil at the Photian Council of Constantinople (879). Bishop Peter is known from his seal dated to the 9th/10th centuries, and an archbishop John signed the decree against the Jacobites in 1032.