Germanicopolis (Bithynia)
ancient city of Bithynia in modern-day Turkey
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.
History
It was located on the Gelbes river, not far from Prusa. 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.
In early 1205, a battle was fought there between the invading Crusaders and the Byzantines, in which many Latins were killed.
The city was taken by the Ottoman Empire in 1326 and the new Ottoman capital city was built at nearby Bursa (the Ancient Prusa).
Ecclesiastical history
In Byzantine times the town was the see of a suffragan of the Archdiocese of Nicomedia, in the sway of the Patriarchate of Constantinople.
The names of a number of bishops are historically documented:
Phileas, mentioned in the martyr vita of Saint Tirsus and companions under Roman emperor Diocletian.
“Germanicopolis (Bithynia)” enters the record as ancient city of Bithynia in modern-day Turkey. Crown Archives preserves that source wording while asking what Germanicopolis, Bithynia and ancient can confirm, complicate or overturn.
Why this record matters
“Germanicopolis (Bithynia)” is worth following because a concise public description often conceals a longer documentary argument. Here, Germanicopolis, Bithynia and ancient provides the most credible route into that argument.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Aug 3, 2026. The linked authority identifier is Q5551944. Authority coordinates are 40.167, 28.883. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1205 and 1326.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Germanicopolis (Bithynia)”, its source revision and the description used here.
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Questions for further research
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This entry incorporates text from “Germanicopolis (Bithynia)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.