It is the concept that a King is 'God's chosen / God's anointed' and is therefore in a way God's representative on Earth to rule, answerable to no-one but God himself for his actions. It is this concept that from the early Middle Ages on, justified absolute, non-democratic rule by a king.
King Louis XIV of France is probably the most famous example of an absolutist king, but at the time and until the days of the French Revolution and in some cases until 1848, most kings had near-absolute power.
Even today, modern Kings who have a no more than ceremonial role as Head of State, still style themselves traditionally as "king by the grace of God".
The divine right of kings.
divine rights
The Petition of Right
The Petition of Right
Divine rights of Kings
It supported the idea called "the divine right of kings". It did not make the king "God on earth", but rather supported the king as chosen by God to rule over men.
that kings had power to rule that was given by god
that kings had power to rule that was given by god
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The divine rights of the kings meant king being given position of equivalence to the god, where his word will be the last word and in return he will always place his interst below that of welfare of his subjects. As the corruption increased, the concentration of power in hands of some rulers made them autocratic, so divine rights were separated by the political rights in Greece, where the divine rights were given to the oracles.
The idea that kings and queens ruled by the will of God was called the divine right of kings. This concept held that monarchs derived their authority directly from God, and therefore their rule was considered absolute and beyond challenge.
Divine Rights of Kings