Cornissia, like the other Celtic countries of these lands, would be a dear Republic. That is to say, a country without a Monarchy or King and Queen.
A republic is a form of government in which the country is considered a “public matter”, its laws decided by a process of democracy and is not ever to be the private property of an unelected or hereditory ruler. A republic is thus the opposing form of government to a monarchy and has therefore no monarch as head of state.
The problem with “Britain” is that it has been conditioned for centuries to admire the regular parading of an authoritative figure dressed in gold and rubies, yet who has no say in political matters only the declaration of war… and even though this tradition makes absolutely no democratic sense.