Essentially, an elective monarchy

An elective monarchy until -510, a plutocratic republic until -27, a variable monarchy for some time after

Elective monarchy and Hereditary monarchy government is the mangols empire.

Malaysia is a federal constitutional elective monarchy and parliamentary democracy.

Monarchy in its raw and ripe natures is a hereditary form of government synonymous to the dynasties.

The page http://en.wikipedia.org/wiki/Monarchy defines monarchy as a form of government in which supreme power is absolutely or nominally lodged with an individual, who is the head of state, often for life or until abdication, and "is wholly set apart from all other members of the state."

Monarch is also prevalent as an elective government in the precession of the papal seat and anything within the cliques and organizations of the Vatican.

With its narrow associations, monarchy is a hereditary government at the same time an elective government.