Noun byzantium has 2 senses
- Byzantium - an ancient city on the Bosporus founded by the Greeks; site of modern Istanbul; in 330 Constantine I rebuilt the city and called it Constantinople and made it his capital
--1 is a kind of city, metropolis, urban center
--1 is a part of Byzantine Empire, Byzantium, Eastern Roman Empire
--1 has member: Byzantine
- Byzantine Empire, Byzantium, Eastern Roman Empire - a continuation of the Roman Empire in the Middle East after its division in 395
--2 is a kind of geographical area, geographic area, geographical region, geographic region
--2 is a part of Roman Empire
--2 has parts: Byzantium
--2 has members: Byzantine
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