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The Empire at its greatest extent in 555 AD under Justinian the Great (its vassals in pink)

The Byzantine Empire was the predominantly Greek-speaking continuation of the Roman Empire during Late Antiquity and the Middle Ages. Its capital city was Constantinople (modern-day Istanbul), originally known as Byzantium. Initially the eastern half of the Roman Empire (often called the Eastern Roman Empire in this context), it survived the 5th century fragmentation and collapse of the Western Roman Empire and continued to thrive, existing for an additional thousand years until it fell to the Ottoman Turks in 1453. During most of its existence, the empire was the most powerful economic, cultural, and military force in Europe.

The Varangians were the elite group of Byzantine fighters.

Both “Byzantine Empire” and “Eastern Roman Empire” are historiographical terms applied in later centuries; its citizens continued to refer to their empire as the Roman Empire (Ancient Greek: Βασιλεία Ῥωμαίων, tr. Basileia Rhōmaiōn; Latin: Imperium Romanum). and Romania (Ῥωμανία).