Oligarchy

When power is effectively vested in a segment of the governed society (typically the richest segment), the result is a government of the few against the many. Often, these oligarchies are organized into powerful families, where the children are raised and groomed simply to propagate and advance the power of the oligarchy, usually at the expense of the governed. Oligarchies often arise as a natural course of maturing of a republic, and often devolve into Authoritarian governments, as one family gains supremacy over all of the others.