 Complete the following phrase:  Genghis Khan August 18, 1227, born Temüjin, was the founder and first Great Khan Emperor of the Mongol Empire, which became the largest contiguous empire in history after his death. He came to power by uniting many of the nomadic tribes of Northeast Asia. After founding the Empire and being proclaimed Genghis Khan an honorary title possibly derived from the Turkic tengiz  sea, meaning the oceanic, universal ruler, he launched the Mongol invasions that conquered most of Eurasia, reaching as far west as Poland in Europe and the Levant in the Middle East. Campaigns initiated in his lifetime include those against the Qara Khitai, 