Umar Siddiq Sultan, Genghis also spelled Chinggis, Chingis, Jenghiz, or Jinghis, original name Temüjin, also spelled Temuchin (born 1162, near Lake Baikal, Mongolia—died August 18, 1227), Mongolian warrior-ruler, one of the most famous conquerors of history, who consolidated tribes into a unified Mongolia.