Christianity was introduced at an early date into Synnada. The
Martyrologium Hieronymianum mentions the martyrs
Trophimus and Dorymedon. A
reliquary of Tromphimus in the form of a
sarcophagus with his bones was discovered here and transported to the
Bursa museum; it may date to the 3rd century.
Eusebius of Caesarea speaks of its pious bishop Atticus who entrusted to the layman Theodore the duty of instructing the Christians. About 230-235 a council on the rebaptizing of heretics was held there.
St. Agapitus, mentioned in the
Roman Martyrology on 24 March as Bishop of Synnada, belonged to
Synaus. For a list of other bishops see
Le Quien,
Oriens christianus, I, 827. Mention must be made of: • Procopius (321); Cyriacus, friend of
St. John Chrysostom • Theodosius and his competitor Agapetus, at first a
Macedonian heretic • Severus (431) Attended
Council of Ephesus • Marinianus (448-51) • Theogenes (536) • Severus (553) •
St. Pausicacus, during the reign of
Emperor Maurice, honoured by the Greek Church on 13 May • Cosmas, 680 • John, adversary of the
iconoclasts in the time of
Patriarch St. Germanus •
St. Michael, honoured by the Latin and Greek churches 23 May, died 23 May, 826, in exile for his zeal in defending the worship of images • Peter under Patriarch
Photius • John under Photius • Pantaleon under
Leo the Wise •
Leo under
Basil II • Nicetas in 1082 • Georgios at the
Council of St. Sophia, about 1450, if one can believe the apocryphal Acts of this council, which perhaps never occurred. The last Bishop of Synnada spoken of in the documents, without mentioning his name, probably lived under
John Cantacuzenus (see "Cantacuz. Hist.", III, 73) and probably never lived at Synnada on account of the Turkish conquest.
Saint Constantine, a converted
Jew of Synnada, lived in the 10th century; he became a
monk, and is honoured by the Greek Church 26 December. In 1370, the see was assumed by the metropolitanate of
Kotyaion, in 1385 by the
metropolitanate of Philadelphia, and in 1394 by Philadelphia again. The metropolitan see of Synnada continues to be included in the list of
titular sees recognized by the
Roman Catholic Church. In 1963, it was assigned to
Marcel-François Lefebvre, who later became a
traditionalist Catholic founding the Society of St. Pius X to preserve the Latin Mass. Since the
Second Vatican Council no new appointments have been made to this eastern titular see. ==Sources==