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Not sure what you mean by "new." Historically, it would be Byzantium. The Byzantine or Eastern Roman Empire began with the Roman Emperor Constantine I in the 4th Century CE; as Western Europe was collapsing into the Dark Ages, he moved the (his new) Roman capitol to the location of Byzantium in Turkey; to become the great city of Constantinople (known today as Istanbul). It continued on as the premier power center of civilization & culture of the Eastern Mediterranean for about a 1000 years, until it was conquered by the Ottomans...
The eastern roman empire, which in modern times, is referred to as the byzantine empire and in their day as the roman empire. also the religion wasn't explicitly Greek orthodoxy, Eastern Orthodoxy would be a better umbrella term.
He moved the capital of the Roman Empire from Rome to Byzantium, which would be the capital of the Byzantine Empire for more than 1,000 years.
He moved the capital of the Roman Empire from Rome to Byzantium, which would be the capital of the Byzantine Empire for more than 1,000 years.
Both the Byzantine Empire and the Islamic Caliphates used the dominant religion (Orthodox Christianity and Sunni Islam respectively) to justify wars of conquest. The religious leadership also helped create an easy way of tracking individuals in the empire by centralizing worship and registries. The provincial divisions in the empire were reinforced by the hierarchical division of religious leaderships (Patriarchs/Synods and Muftis respectively). Additionally, the religions provided a code of ethics that would serve as a basis to the legal codices of the countries.
You may not find total agreement on this answer, but I would have it begin in the year 476 with the fall of the Western Roman Empire. The Byzantines did not call themselves Byzantines any more than the ancient Greeks called themselves Greeks. The Byzantine Empire is modern nomenclature to avoid confusion with the Eastern Roman Empire after the Roman Empire was divided, but before the Western Roman Empire fell.
The Byzantine Empire (the surviving, and Greek, part of the Roman Empire) was not a theocracy; it had a secular ruler, not a priest as ruler. However, the Greek Orthodox Church had a significant role in Greek society, and in matters where the Church had a considerable interest, its concerns would have been taken into account, and even guided the ruler's decision. As the Byzantine Empire shrank over its 1000 year history, the Greek Patriarch of Constantinople came to be the undisputed head of the Church in the Byzantine Empire, but he was never actual or defacto ruler of the state.
Constantine the Great designated Byzantium as his imperial capital, redeveloped and renamed it Constantinople, after himself - Constantinople means city of Constantine. However, this did not lead to the beginning of the Byzantine Empire. In fact, the Byzantine Empire did not actually exist. This is a term which has been coined by historians to indicate the eastern part of the Roman Empire after the fall of the western part of this empire and which became popular in the 19th century. The people in question did not know this term and called their empire Roman Empire. Therefore, it would be more appropriate to talk of a "Byzantine" period. This started about a century later.
The Byzantine Empire is usually said to be started in 330, when Constantine changed his capital. It when through huge recoveries by Justinian, and followed a long decline. Basil II and the Komnenus kept the empire standing longer, but even them could not prevent the eventual fall of Constantinople in 1453. So from 330 to 1453, if would be 1,123 years.
Byzantine Influence: The Byzantine empire influenced the early Russians for many reasons. One was that they converted all the Slavs (Early Russians) to Christianity. After that, they took on the Greek alphabet and converted all the Bibles into a Slavic tongue Which easily means that they gave them language. Vladimir made the orthodox Christianity the religion of the Russians. Soon, Russians adapted aspects of the Byzantine culture such as art, music, architecture and an example of this is Byzantine domes started to take on an onion shape which is typical in Russian churches.
The Eastern Emperor of the Byzantine empire allegedly paid Attila the Hun a fee so the empire would not be attacked.
The Byzantine Empire declined after Islam spread. The words "Islam spread" are nebulous. If the question is referring to the Rise of Islam period, when Mohammed and the Rightly-Guided Caliphs were spreading Islam, then yes, the Byzantine Empire decline after these events. If, however, you are referring to the Seljuk and Ottoman conquests of Anatolia nearly 600 years later which eventually ended the Byzantine Empire, the Empire was in decline long before these armies trampled the Byzantines to the ground. The answer is more complex than the above answers would purport. See the link below for another relevant answer.