Aristotle's theory of a person's "function" said that:

According to the ideas of Aristotle, each type of government is matched with its definition as follows:

1. One leader working for his own benefit - Aristocracy
2. A few working for the good of the people - Democracy
3. Dangerous mob self-rule - Tyranny

Aristotle was a Greek philosopher, scientist and logician. He is regarded as one fo the most influential ancient thinkers in a variety of fields, including political theory. He believed that one of the most important roles of a politician is that of a law-maker. A politician needs to be involved in the construction of a constitution for the country he represents.