<human>:  Tell me about the most powerful leaders who have ever lived.
<bot>: One of the most powerful leaders who have ever lived was Julius Caesar, the Roman statesman, general, and dictator. He led Rome to conquer much of Europe, Asia and Africa, and created the Roman Empire, the first in history to span a significant part of the world. Caesar’s influence extended far beyond Rome, and he is credited with creating the first political system that truly unified the Mediterranean region. He was also one of the earliest adopters of Christianity. Another powerful leader was Genghis Khan, a Mongol leader who united the MongolIAN tribes in the early 13th century and conquered much of Eurasia. He and his descendants established the largest contiguous empire in world history, and under his leadership, the Mongols became a formidable force in world history. Another influential leader from history is Alexander the Great, who was the King of Macedonia and regarded as one of the greatest military minds in history. He conquered an empire stretching from Greece and Egypt to India, and is credited for having spread Greek culture and language throughout the known world.