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The Diocese of Germa in Galatia or Germensis in Galatia is a suppressed see and now a titular see of the Roman Catholic Church. Its seat was at Germensis in Galatia (also known as Germocolonia or Germacolonia) in the province of Galatia in the civil diocese of Pontus (present day northern central Turkey). It formed part of the Patriarchate of Constantinople and was a suffragan see of the Archdiocese of Pessinus. Only one bishop of the see is known, Eustacius, who is mentioned as attending the Fourth Council of Constantinople in 879 which rehabilitated patriarch Photios I of Constantinople.
A titular see in various churches is an episcopal see of a former diocese that no longer functions, sometimes called a "dead diocese".
Ancient Galatia was an area in the highlands of central Anatolia, roughly corresponding to the provinces of Ankara, Çorum, and Yozgat, in modern Turkey. Galatia was named for the Gauls from Thrace, who settled here and became its ruling caste in the 3rd century BC, following the Gallic invasion of the Balkans in 279 BC. It has been called the "Gallia" of the East, Roman writers calling its inhabitants Galli.
The Diocese of Pontus was a diocese of the later Roman Empire, incorporating the provinces of northern and northeastern Asia Minor up to the border with the Sassanid Empire in Armenia. The diocese was established after the reforms of Diocletian, and its vicarius, headquartered at Amaseia, was subordinate to the Praetorian prefecture of the East. Its military forces, facing the Sassanid threat, were commanded by the dux Ponti et Armeniae until the middle of the 5th century, and by two separate duces afterwards, until Justinian I instituted a new magister militum per Armeniam for the Armenian frontier. Justinian's reforms also abolished the diocese in 535, and its vicar was made into the governor of Galatia I. The results however were not satisfactory, and the diocese was reestablished in 548, continuing to function until replaced by the themata of Armeniakon and Opsikion in the later 7th century. On the north east shore of the Black Sea, the cities Nitike, Pitiyus, and Dioscurias were part of the diocese until the 7th century. The diocese included 12 provinces: Bithynia, Honorias, Paphlagonia, Helenopontus, Pontus Polemoniacus, Galatia I and Galatia II (Salutaris), Cappadocia I and Cappadocia II, Armenia I, Armenia II, Armenia Maior and the autonomous Armenian principalities (Satrapiae) in the area of Sophene. In 536, Armenia III and Armenia IV were created.
