Question: Who was the main person that introduced the social contract theory of government?
Disambiguated questions and answers: question: Who was the main person that introduced the social contract theory of government in his book Leviathan?
Who was the main person that introduced the social contract theory of government, arguing for freedom?
Who was the main person that introduced the social contract theory of government based on unlimited popular sovereignty?
answer: Hobbes
Thomas Hobbes
Locke
John Locke
Rousseau
Jean-Jacques Rousseau
Natural Questions answer: Jean - Jacques Rousseau (from the Wikipedia article "Social contract")