Greatest Empire in History — Rome, Britain, Mongolia or Ottoman?

Throughout human history empires have risen to dominate the world — each leaving an indelible mark on civilization. The Roman Empire built roads, law and culture that defined the Western world for 2,000 years. The British Empire was the largest in history at its peak, covering a quarter of the world. The Mongol Empire under Genghis Khan was the largest contiguous land empire ever built. The Ottoman Empire lasted over 600 years and connected three continents. Which was the greatest empire in history?

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