A dictator.
Dictatorship
A country whose ruler has unlimited power is called an autocracy.
An absolute ruler is a ruler that has unlimited power over their country.
He is a dictator and has all the power.
dictator
If a country does not have a ruler, then it is simply ruled in a democracy or the people are the power.
Hitler is a dictator- a single ruler with absolute power on the country over which he rules.
They were the ruler of a super power country and they sent Christopher Columbus out to steal anything he could from other countries and bring it back to Queen Isabella to raise her wealth. And with wealth comes power to her country.
A ruler that has unlimited power and authority over his or her power is an absolute monarch.
A ruler who has absolute power can be called a dictator or despot.
Dictator: a ruler with total power over a country, typically one who has obtained power by force. That's what Adolf Hitler was.
ruler could mean anything really ruler as in the one what you measure stuff with or a leader