Final answer:
Monarchy and Dictatorship are the types of government ruled by one.
Step-by-step explanation:
The types of government that are ruled by one are Monarchy and Dictatorship.
A monarchy is a form of government where a single person, usually a hereditary ruler, holds political power. Examples of monarchies include Saudi Arabia and the United Arab Emirates, where the power of the monarchs is unrestricted.
In a dictatorship, a single person or a very small group wields complete and absolute authority over a government or populace. Dictators rise to power usually through economic or military might. Examples of dictatorships include North Korea under Kim Jong-un.