++History:
In Episode 79 we figure out that Jaken was not only Sesshoumaru's Retainer. He was once a Lord of his tribe. His tribe was always in a War. One day an evil lady demon came and was about to kill Jaken when Sesshoumaru (Yay!!) was passing by. Sesshoumaru used his whip and cut off the demons arms and Jaken was set free! Sesshoumaru finished off the demon. Jaken told all his tribe to make room for Sesshoumaru to pass, and they did. Jaken, ran after Sesshoumaru (since he saved his and his tribes life asking to be his retainer.) The tribe was speechless. Sesshoumaru ignored Jaken for numbers of days until they stopped at a waterfall. He pulled out the Staff of Heads and gave it to Jaken. If Jaken knew how to use it, he would stay and obey Sesshoumaru. And he learned how to use it (Yaaayy!).
One Day Jaken might return and be Lord of his tribe again. =)