King

The King is the ruler of a Kingdom, which either consists of a country or land mass that is marked out by war, treaties, water, ect... He governs the whole area from his throne, usually central in the Kingdom. He will set Duchies over smaller areas to help govern the people. And those Duchies often set several Baronies under them as they grow larger.

Qualifications

They need to be the first born of the previous King. They need the power of the heir in their blood. (It looks different for every heir, but is always obvious.)

Form of Address

Your Majesty

Source of Authority

The people, or through lineage.

Length of Term

Until death or deemed unworthy to serve.