Temujin, the founder and first emperor of the Mongol Empire, changed his name to Genghis Khan after he united the warring Mongol tribes into a single powerful confederation in the early 13th century. The name "Genghis" means "an ocean" or "a great" in the Mongolian language, while "Khan" is a title meaning "ruler" or "leader". The name change marked the beginning of Genghis Khan's rise to power and his eventual conquest of much of Eurasia, which earned him a place in history as one of the greatest military commanders of all time.