Ratan Singh Bhangu a descendant of Bhai Mehtab Singh. Rattan Singh took upon himself the task of proving that the Sikh political power was perfectly legitimate. He begins by reiterating the basic Sikh theory of polity. It must be considered authentic because it is in accord with the religious text and coming from Bhangu, who himself belonged to the ruling aristocracy, it perhaps also represents its thought on the subject.