Temüjin began his ascent to power by offering himself as an ally (or, according to other sources, a vassal) to his father's anda (sworn brother or blood brother) Toghrul, who was Khan of the Keraites. This relationship was first reinforced when Börte was kidnapped by Merkits in around 1184. To win her back, Temüjin called on the support of Toghrul, who offered 20,000 of his Keraite warriors and suggested that Temüjin involve his childhood friend Jamukha, who was Khan of his own tribe, the Jadaran.