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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:"From 1628 to 1642, French sailors captured slaves on foreign slave ships and brought them into the French colonies. "French settlers also bought slaves from foreign slave ships," Frederic Regent, a historian at Paris' Sorbonne, told Enjeux magazine in 2008.
Answer:
c. The cross staff could tell latitude by the stars.
Explanation:
:):