Basileia Rhōmaiōn [Greek] Eastern Roman Empire |
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| Motto: “One Empire, one Church, one Law.” | ||||
 Location of the Eastern Roman Empire in purple.
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| Capital (and largest city) | Constantinople | |||
| Official languages | Latin, Greek | |||
| Religion | Nicene Christianity | |||
| Establishment | 395 A.D. | |||
| Population | ||||
| - | estimate | 8.000.000 | ||
| Currency | Solidus | |||
The Basileia Rhōmaiōn (Latin: Imperium Romanum) also referred to as the Eastern Roman Empire, Byzantium, or simply as Roman Empire, was the continuation of the Roman Empire in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinople. It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist until the Modern Age.
The Empire entered in a union with the Carolingian Empire after the marriage of Empress Irene of Athens and Charlemagne in 802. Charlemagne was crowned by Pope Leo III as Roman Emperor in 800 and after the marriage, Irene recognized this claim. This union allowed the cultural interchange between the two Empires, approaching West and East. The union ended in 820 when Empress Irene died, but the alliance formed between the two Empires remained with Theodosius IV, son of Irene and Charlemagne, and his successors.