Convincing the rest of the group that you have supernatural powers of control will make you a God or Goddess, at least that was the way it was for many ancient tribes. In the instance of men, if the "power" was believed to be passed to the Wizard's son or relative, the position was handed down. The heir to the throne, so to speak. We see this in modern political families. The great talker, the great negotiator, convinces us that their heir is the next great wizard of politics. If a man had these magical powers and the skill of a warrior these men became King and their sons or nephews inherited the title whether they were competent or not.
Suellen Ocean is the author of the historic novels The Lies of the Lion and The Guild available at Amazon, B&N and Ocean-Hose. http://www.pacificsites.com/~oceanhose/