Genghis Khan was a Mongolian Emperor.
Genghis's army invaded Van, and took the First and Third Pillars (the Second having already been stolen). Genghis gave the First Pillar to a Bedouin tribe as a gift of thanks for aiding him, a tribe which became the Royal House of Saud. The Third Pillar was given to the Shogun of Japan (which in turn was later given to the Royal Emperial family) at Hokkaido.
The Shogun in turn gave Genghis a shield painted with images of the entrances to the Six Vertices, taken from a petrified dinosaur egg inside the Third Vertex, and was put to rest with it in what would become Genghis's tomb in his Lost Arsenal, which he had decided to convert shortly before his death.
Needing the Egg to help determine the entrances to the remaining Vertices, Wolf and the CIEF and Jack West Jr.'s team located the Lost Arsenal, but Tank and the Japanese Blood Brotherhood destroyed the Egg. As Jack's team tried to find another way out, the dying Epper pointed out a sarcophagus in the chamber, which Jack realised contained Genghis's body. Remembering the Mongolian Emperor's maxim, they uncovered a secret escape route.