John Locke - English philosopher; argued that government exists to protect "life, liberty, and property". He believed humans enjoyed certain rights that no government can take away.
Baron de Montequieu - French writer who devoted himself to the study of political liberty. He outlined a structure of government that consisted of three branches including the Executive, Legislative, and Judicial.
Jean- Jacques Roussuau- His book The Social Contact, he argued when the people enter into a social contract, they agree to be ruled by the "General will"