King / Queen

King is the title given to a male monarch in a variety of contexts and the Queen id the female counterpart.  A ruling King may have a Queen at his side but under his authority, If a queen is the one on the throne the title for the spouse us usually Prince Consort.

Qualifications

Be born as eldest child and survive until the current king dies

Requirements

Must reach the age of majority, if the current ruler dies before then a Regent will rule until they come of age.
Info taken from https://en.wikipedia.org/wiki/King
Type
Nobility, Hereditary
Form of Address
His Highness, His Royal Highness
Source of Authority
the title of king as the ruler of a kingdom is understood to be the highest rank in the feudal order, potentially subject, at least nominally, only to an emperor if one exists.
Length of Term
From the death of his or her parent until his or her death.
Reports directly to
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