He succeeded in consolidating his people and gaining rule over them at the khuriltai of 1206 and went on to lead them against the Kwarezm Empire as well as the Hsia and Ch'in kingdoms.  
One early victory was over the Merkit who had kidnapped his wife Borte.  In this fight and in his later rise to power he was greatly aided by Togril, a friend of his father Yekusai, whom he later turned against.  He succeeded in consolidating his people and gaining rule over them at the khuriltai of 1206 and went on to lead them against the Kwarezm Empire as well as the Hsia and Ch'in kingdoms.  He died while on campaign in China and was succeeded by his son Ogadai.  FTP, identify this great Mongol ruler, the grandfather of Kublai.
One early victory was over the Merkit who had kidnapped his wife Borte.  
Genghis Khan or Jenghiz Khan or Chaangyus Khan or Temujin