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| Nikomedeia | |
|---|---|
| Name | Nikomedeia |
| Native name | Νικομήδεια |
| Other names | Nicomedia |
| Region | Bithynia |
| Founded | 8th century BCE (as Astakos) |
| Refounded | 264 BCE (as Nikomedeia) |
| Founded by | Antiochus I Soter / Nikomedes I of Bithynia |
| Coordinates | 40°44′N 29°56′E |
| Modern location | İzmit |
Nikomedeia
Nikomedeia was an ancient city in Bithynia on the Gulf of Izmit, refounded in the Hellenistic period and later serving as a principal seat for Mithridates VI of Pontus, Julius Caesar, Octavian, and emperors of the Roman Empire and Byzantine Empire. Located near the junction of routes connecting Anatolia, Thrace, Paphlagonia, and Phrygia, the city featured prominently in conflicts involving Seleucid Empire, Pergamon, Pontus War, and the Gallic invasions of the Balkans. Its strategic position made it a focus for rulers such as Nikomedes I, Pergamene Kingdom, Pompey the Great, and later governors under Diocletian and Constantine the Great.
Nikomedeia's chronology ties to Astakos (Bithynia), refoundation by Nikomedes I of Bithynia and expansion under client kings linked to the Seleucid Empire and the Macedonian dynasty. The city appears in accounts of the Third Mithridatic War, negotiations of Lucius Cornelius Sulla, and imperial decisions by Augustus that reconfigured provincial boundaries with Bithynia et Pontus. During the Crisis of the Third Century, Nikomedeia faced incursions by Goths, Sarmatians, and rival claimants tied to Gallienus and Aurelian. In the Late Antique era the city rose to renewed prominence when Diocletian and Galerius used Anatolian urban centers for administrative reforms that preceded the court relocations of Constantine I and the later eastern focus culminating in Constantinople.
The urban plan lay on a coastal plain at the head of a sheltered inlet of the Sea of Marmara, bounded by the Bithynian Olympus foothills and connected to inland routes toward Ankara and Sakarya River valleys. Major thoroughfares linked to ports that served Ephesus, Heraclea Pontica, and Byzantium, while local topography dictated a grid of agora, agora-adjacent temples, and a theater oriented toward natural amphitheaters as seen in Hellenistic models from Pergamon and Smyrna. Defensive works reflected influences from sieges similar to those at Nicaea and Nicomedia-era fortifications contemporaneous with reforms by Justinian I.
The city's economy revolved around maritime commerce in the Propontis connecting to trade networks of Alexandria, Antioch, Rhodes, and Massalia. Exports included grain, timber, and regional textiles traded alongside imports of Egyptian grain, Syrian wine, and Aegean pottery from workshops in Athens and Corinth. Fiscal administration tied to imperial systems like those under Diocletian and tax reforms influenced commerce with merchants licensed under laws promulgated during reigns of Hadrian, Marcus Aurelius, and later Leo III the Isaurian.
Civic life blended Hellenistic institutions, Roman civic cults, and Christian communities documented in councils and correspondences involving bishops referenced in records of the Council of Nicaea milieu and later ecclesiastical politics with Patriarch of Constantinople. Literary and philosophical currents connected the city to schools in Athens, Alexandria, Pergamon, and itinerant rhetoricians who circulated between courts of Ephesus and Smyrna. Social hierarchy reflected landed elites allied to dynasts like Nikomedes IV and imperial administrators aligned with senatorial families known from inscriptions referencing Claudius and Trajan.
Monumental architecture included a Hellenistic agora, a Roman theater, baths influenced by designs from Baths of Caracalla prototypes, and a fortified acropolis comparable to those at Nicaea and Smyrna. Temples dedicated to deities worshipped across Anatolia such as Zeus, Artemis, and cults linked to Cybele sat near imperial mausolea and administrative basilicas similar in plan to those in Thessalonica and Ephesus. Public inscriptions and sculptural programs exhibit artistic ties to workshops from Pergamon and sculptors patronized by the Attalid dynasty and later imperial patrons under Hadrian.
As a capital of Bithynia under client kings and a key locus for Roman provincial administration, Nikomedeia hosted provincial governors, military detachments coordinated with units stationed at Ancyra and along the Danube frontier, and served as a judicial center under imperial edicts similar to rescripts issued by Antoninus Pius. Administrative evolution paralleled reforms by Diocletian that redefined dioceses and prefectures, situating the city within imperial bureaucratic networks connected to Constantinople and provincial capitals like Nicomedia-adjacent Nicaea.
Modern archaeological work near İzmit has uncovered mosaics, public baths, and inscriptions published in surveys alongside finds from contemporaneous sites such as Prusias ad Hypium and Libyssa. Excavations led by Turkish and international teams have employed stratigraphic methods similar to projects at Ephesus and Pergamon, revealing coin hoards bearing images of Nikomedes II, Hadrian, and Constantine I. Ongoing fieldwork involves conservators from institutions associated with Istanbul Archaeology Museums and university collaborations paralleling programs at University of Oxford and University of Istanbul.
Category:Ancient cities in Anatolia