Ancient Greek: Γερμανικόπολις
Germanicopolis (Greek: Γερμανικόπολις) was an ancient town in Bithynia, also known as Caesarea in Bythinia (not to be confused with Caesarea Germanica, as such a former bishopric and present Latin Catholic titular see.
It was located on the Gelbes river, not far from Prusa (modern Bursa in Turkey). In earlier times it was called Helge, Helgas or Booscoete (Βοὸς κοίτη), Plin. v. 40. Modern scholars locate the town at the village of Tahtalı
The names of a number of bishops are historically documented :
- Phileas, mentioned in the martyr vita of saint Tirsus and companions under Roman emperor Diocletianus.
- Rufus, attending the First Council of Nicaea
- Paul(us), partook in the minor Council of Constantinople of 518
- Johannes, attended the Council of Constantinople convoked by Patriarch Mennas of Constantinople in 536
- Theodosius quarreled with Maximus the Confessor
- Theodorus, partook in the Third Council of Constantinople
- Constantinus, attending the Second Council of Nicaea
- Theofilus, partook in the Council of Constantinople of 879-880 which rehabilitated Photius as Patriarch of Constantinople.
The diocese was nominally restored in 1933 as Latin Titular bishopric of Cesarea in Bithynia (Latin) / Cesarea di Bitinia (Curiate Italian) / Cæsarien(sis) in Bithynia (Latin adjective).
It is vacant since decades, having had the following incumbents, so far of the fitting Episcopal (lowest) rank :
- Anthony Jeremiah Pesce, Passionist (C.P.) (born Italy) (1951.05.10 – 1953.03.25) as last Apostolic Vicar of Dodoma (Tanzania) (1951.05.10 – 1953.03.25); next (see) promoted first Bishop of Dodoma (Tanzania) (1953.03.25 – death 1971.12.20)
- Giovanni Sismondo (1954.09.30 – 1955.02.21) (Italian), on emeritate : previously Bishop of Pontremoli (Italy) (1930.02.06 – 1954.09.30); later (promoted) Titular Archbishop of Marcianopolis (1955.02.21 – death 1957.12.07)
- Secondo Chiocca (1955.04.15 – death 1982.01.05) first as Auxiliary Bishop of Archdiocese of Genova (Genua, Italy) (1955.04.15 – retired 1981.05.09), then as emeritate; previously Bishop of [[Roman Catholic Diocese of Foligno (Italy) (1947.01.18 – resigned 1955.04.15).
- GCatholic - (former and) titular bishopric
- Richard Talbert, Barrington Atlas of the Greek and Roman World, (ISBN 0-691-03169-X), Map 52 & text.
- Bibliography - ecclesiastical history
- Pius Bonifacius Gams, Series episcoporum Ecclesiae Catholicae, Leipzig 1931, p. 443
- Michel Lequien, Oriens christianus in quatuor Patriarchatus digestus, Paris 1740, vol. I, coll. 627-628
- Raymond Janin, lemma 'Césarée de Bithynie', in Dictionnaire d'Histoire et de Géographie ecclésiastiques, vol. XII, Paris 1953, col. 199