<P> The origins of the name of Byzantion, more commonly known by the later Latin Byzantium, are not entirely clear, though some suggest it is of Thraco - Illyrian origin . The founding myth of the city has it told that the settlement was named after the leader of the Megarian colonists, Byzas . The later Byzantines of Constantinople themselves would maintain that the city was named in honour of two men, Byzas and Antes, though this was more likely just a play on the word Byzantion . </P> <P> The city was briefly renamed Augusta Antonina in the early 3rd century AD by the Emperor Septimius Severus (193--211), having razed the city to the ground in 196 for supporting a rival contender in the civil war and rebuilt, in honour of his son Antoninus, the later Emperor Caracalla . The name appears to have been quickly forgotten and abandoned, and the city reverted to Byzantium / Byzantion after either the assassination of Caracalla in 217 or, at the latest, the fall of the Severan dynasty in 235 . </P> <P> Byzantium took on the name of Kōnstantinoupolis ("city of Constantine", Constantinople) after its refoundation under Roman emperor Constantine I, who transferred the capital of the Roman Empire to Byzantium in 330 and designated his new capital officially as Nova Roma (Νέα Ῥώμη)' New Rome' . During this time, the city was also called' Second Rome',' Eastern Rome', and Roma Constantinopolitana . As the city became the sole remaining capital of the Roman Empire after the fall of the West, and its wealth, population, and influence grew, the city also came to have a multitude of nicknames . </P> <P> As the largest and wealthiest city in Europe during the 4th--13th centuries and a centre of culture and education of the Mediterranean basin, Constantinople came to be known by prestigious titles such as Basileuousa (Queen of Cities) and Megalopolis (the Great City) and was, in colloquial speech, commonly referred to as just Polis (ἡ Πόλις)' the City' by Constantinopolitans and provincial Byzantines alike . </P>

What is the difference between byzantium and constantinople
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