They are windows into a time in Korea's history when absolute monarchs ruled.

Periods for which no Minister's name is shown are those in which the monarch ruled personally or through mere favourites.

Last monarch to rule both Hanover and the United Kingdom.

Prior to the establishment of parliament, the monarch ruled absolutely by the issuing of his personal written orders, open or closed.

There have also been several cases of coregencies where two monarchs ruled simultaneously.

Prior to this the monarchs have ruled under a Council of Chiefs.

The 1383-1385 Crisis followed, a period of political anarchy, when no monarch ruled the country.

The last monarch ruled for a few weeks before being overthrown by a Constitutional Referendum, and a new republic was then proclaimed.

Elizabeth was the first Tudor to recognise that a monarch ruled by popular consent.

For centuries, monarchs ruled by the idea of divine right.