noun
Eastern Roman Empire
Historical term referring to the eastern part of the Roman Empire after the division, commonly known as the Byzantine Empire.
東ローマ帝国は一四五三年に滅亡した。
The Eastern Roman Empire fell in 1453.
Often used interchangeably, but ビザンツ帝国 specifically refers to the medieval Greek-speaking continuation, while 東ローマ帝国 emphasizes the Roman heritage.
Compound of 東 (east) + ローマ (Rome) + 帝国 (empire), a direct translation of 'Eastern Roman Empire'.