First he allowed Eusebius of Nicomedia, who was a protégé of his sister, and Theognis to return once they had signed an ambiguous statement of faith.

Eusebius and Theognis remained in the Emperor's favour, and when Constantine, who had been a catechumen much of his adult life, accepted baptism on his deathbed, it was from Eusebius of Nicomedia.

His advisor in these affairs was Eusebius of Nicomedia, who had already at the Council of Nicea been the head of the Arian party, who also was made bishop of Constantinople.

He continued to lead the conflict against the Arians for the rest of his life and was engaged in theological and political struggles against the Emperors Constantine the Great and Constantius II and powerful and influential Arian churchmen, led by Eusebius of Nicomedia and others.

Support for Arius from powerful bishops like Eusebius of Caesarea and Eusebius of Nicomedia, further illustrate how Arius ' subordinationist Christology was shared by other Christians in the Empire.

Diocletian believed that Romanus of Caesarea was arrogant, and he left the city for Nicomedia in the winter, accompanied by Galerius.

Constantine had traveled through Palestine at the right hand of Diocletian, and was present at the palace in Nicomedia in 303 and 305.

In an attempt to resolve the difficulty and slowness of transmitting orders to the frontier, the new capitals of the Tetrarchic era were all much closer to the Empire's frontiers than Rome had been: Trier sat on the Rhine, Sirmium and Serdica were close to the Danube, Thessaloniki was on the route leading eastward, and Nicomedia and Antioch were important points in dealings with Persia.

Eusebius of Nicomedia ( died 341 ) was the man who baptised Constantine the Great.

He was a bishop of Berytus ( modern-day Beirut ) in Phoenicia, then of Nicomedia where the imperial court resided in Bithynia, and finally of Constantinople from 338 up to his death.

It was of particular interest that Eusebius was nearly persecuted because of his close relationship to the Emperor Licinius while serving as Bishop of Nicomedia during Licinius ' reign.

Initially growing up in Bithynia, raised by his maternal grandmother, at the age of seven he was under the guardianship of Eusebius of Nicomedia, the semi-Arian Christian Bishop of Nicomedia, and taught by Mardonius, a Gothic eunuch, whom Julian wrote warmly of later.

At the age of 18, the exile was lifted and he dwelt briefly in Constantinople and Nicomedia.

The city of İzmit or Nicomedia was also captured in 1337.

With the conquest of Karesi, nearly the whole of northwestern Anatolia was included in the Ottoman Empire, and the four cities of Bursa, Izmit ( Nicomedia ), Iznik ( Nicea ), and Bergama ( Pergamum ) had become strongholds of its power.

After the followers of Eusebius of Nicomedia ( who was now the Patriarch of Constantinople ) had renewed their deposition of Athanasius at a synod held in Antioch in 341, they resolved to send delegates to Constans, Emperor of the West, and also to Julius, setting forth the grounds on which they had proceeded.

It is likely that Saint George was born to a Christian noble family in Lod, Syria Palaestina during the late third century between about 275 AD and 285 AD, and he died in Nicomedia.

* Nicomedia in northwestern Asia Minor ( modern Izmit in Turkey ), a base for defence against invasion from the Balkans and Persia's Sassanids was the capital of Diocletian, the eastern ( and most senior ) Augustus ; in the final reorganisation by Constantine the Great, in 318, the equivalent of his domain, facing the most redoubtable foreign enemy, Sassanid Persia, became the pretorian prefecture Oriens ' the East ', the core of later Byzantium.

Ulfilas was ordained a bishop by Eusebius of Nicomedia and returned to his people to work as a missionary.

Gaining sole reign of the empire, he is also noted for re-establishing a single imperial capital, choosing the site of ancient Byzantium in 330 ( over of the current capitals, which had effectively been changed by Diocletian's reforms to Milan in the West, and Nicomedia in the East ) to build the city soon called Nova Roma ( New Rome ); it was later renamed Constantinople in his honor.

He studied in Athens and began his career in Constantinople as a private tutor, but was soon exiled to Nicomedia.

Theodosius ' son was captured by Leo in Nicomedia, and Theodosius chose to resign the throne on 25 March 717.

Nicomedia was the metropolis of Bithynia under the Roman Empire, and Diocletian made it the eastern capital city of the Roman Empire in 286 when he introduced the Tetrarchy system.

Nicomedia remained as the eastern ( and most senior ) capital of the Roman Empire until co-emperor Licinius was defeated by Constantine the Great at the Battle of Chrysopolis ( Üsküdar ) in 324.

Nicomedia was the metropolis of Bithynia under the Roman Empire ( see Nicaea ), and Diocletian made it the eastern capital city of the Roman Empire in 286 when he introduced the Tetrarchy system.

Nicomedia remained as the eastern ( and most senior ) capital of the Roman Empire until Licinius was defeated by Constantine the Great in 324.

In 358, the Roman Emperor Constantius II requested two councils, one of the western bishops at Ariminum and one of the eastern bishops ( planned for Nicomedia but actually held at Seleucia ) to resolve the Arian controversy over the nature of the divinity of Jesus Christ, which divided the 4th-century church.

The most important cities were Nicomedia, founded by Nicomedes, and Nicaea.

In imitation of his father, and so many others of the Greek rulers of Asia, he determined to perpetuate his own name by the foundation of a new capital and the site that he chose, in the immediate neighbourhood of the Megarian colony of Astakos, was so judiciously selected that the city of Nicomedia continued for more than six centuries to be one of the richest and most flourishing in Anatolia.

After being destroyed by Lysimachus, it was rebuilt by Nicomedes I of Bithynia in 264 BC under the name of Nicomedia, and has ever since been one of the most important cities in northwestern Asia Minor.

Also there were Eusebius of Caesarea, Eusebius of Nicomedia and the young deacon Athanasius, who would become the champion of the Trinitarian dogma ultimately adopted by the council and spend most of his life battling Arianism.

After being destroyed, it was rebuilt and founded by Nicomedes I of Bithynia in 264 BC under the name of Nicomedia, and has ever since been one of the most important cities in northwestern Asia Minor.

By the time the Visigoths under their king Alaric entered Italy and sacked Rome in 410 – the first time a foreign army had set foot in Rome since 390 BC, some 800 years earlier – Rome had ceased to be capital of the Empire either in East or West ( the capital in the East was Nicomedia from 286 to 330, and Constantinople from 330 onward ; in the West it was Milan from 286 to 402, and Ravenna from 402 onward ); indeed, by that point in history, the Bishop of Rome was one of the few senior Ecclesiastical or Imperial officials in the Roman Empire to actually reside in Rome.

He established new administrative centers in Nicomedia, Mediolanum, Antioch, and Trier, closer to the Empire's frontiers than the traditional capital at Rome had been.

Diocletian chose to stay in the Eastern Roman Empire ( capital Nicomedia ) and his colleague Maximianus ruled the Western one.

** Nicomedia ( northwestern Asia Minor ) becomes the capital of Diocletian

He transfers his capital to Nicomedia ( Turkey ).

Arrian was born of Greek ethnicity in the coastal town of Nicomedia ( present-day Izmit ), the capital of the Roman province of Bithynia, in what is now north-western Turkey, about 70 km from Byzantium ( later Constantinople, now Istanbul ).

Constantine mainly resided in Nicomedia as his interim capital city for the next six years, until in 330 he declared the nearby Byzantium ( which was renamed Constantinople ) the new capital.

Owing to its position at the convergence of the Asiatic roads leading to the new capital, Nicomedia retained its importance even after the foundation of Constantinople.

From the 840s on, Nicomedia was the capital of the thema of the Optimatoi.

In 293, with the establishment of tetrarchy, the Roman Empire was split into four parts ; Sirmium became one of the four capital cities of Roman Empire, the other three being Augusta Treverorum, Mediolanum, and Nicomedia ( modern Trier, Milan and Izmit ).

Following Constantine's victory over co-emperor Licinius at the Battle of Chrysopolis ( Üsküdar ) in 324, Nicomedia served as an interim capital city for Constantine the Great between 324 and 330, until the nearby Byzantium was officially declared Nova Roma ( later known as Constantinople, present-day Istanbul ).

Constantine mainly resided in Nicomedia as his interim capital city for the next six years, until in 330 he declared the nearby Byzantium as Nova Roma, which eventually became known as Constantinople.

Owing to its position at the convergence of the Asiatic roads leading to the new capital, Nicomedia retained its importance even after the foundation of Constantinople.

The son of Osman, Orhan I, conquered Nicaea in 1331 and Nicomedia in 1337 and established the capital in Bursa.

In 293, with the establishment of tetrarchy, the Roman Empire was split into four parts ; Sirmium emerged as one of the four capital cities of Roman Empire, the other three being Trier, Mediolanum, and Nicomedia.

At first a haphazard form of power sharing, this eventually settled on an East-West administrative division between the Western Roman Empire ( centered on Rome, but now usually presided from other seats of power such as Trier, Milan, and especially Ravenna ), and the Eastern Roman Empire ( with its capital initially in Nicomedia, and later Constantinople ).