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When was Constantinople formally dedicated as the Roman imperial capital?
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Constantine I
Portrait head of Constantine I, marble, Roman, c. 325ā370 ce; in the Metropolitan Museum of Art, New York City.
Constantinople was formally dedicated as the Roman imperial capital on May 11, 330 CE.123
Following his victory over the rival emperor Licinius in 324 CE, Constantine I chose the site of the ancient city of Byzantium to establish his new capital. The inauguration of the city, which Constantine referred to as "New Rome," symbolized a significant shift in the Roman Empire, marking a departure from its pagan past and the beginning of a new Christian era.4523