The 4th century was the century that lasted from January 1, 301 to December 31, 400 in the Gregorian calendar.

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Roman navy propelled by animals instead of human rowers?

I have read one brief account of military planning around the time of Roman emperor Constantine the Great (272 – 337) whereby the Roman navy's rowers could have been substituted by animals (source ...
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Why was Goguryeo able to expand rapidly under Gwanggaeto's rule?

While watching a Korean drama called Gwanggaeto, the Great Conqueror and seeing how the king is praised by Koreans, I am curious to know what historical factors led to Kokuryŏ being able to conquer ...