The answer is Emperor Constantine.
He was a Roman King of Greek background who changed history by becoming the first Roman Emperor to convert to Christianity.
He also moved the capital of his Empire to Byzantium, modern-day Istanbul. The city bore his name for much of the next thousand or so years, being known as Constantinople.
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The transatlantic slave trade began in the 15th century<span>, after the Portuguese started exploring the coast of West Africa.</span>
A. James Polk's aggressive foreign policy
