John Locke is the enlightenment philosopher who is most closely associated with the idea that government exists only by consent of the people.
John Locke was an English philosopher and physician, considered as one of the most influential of Enlightenment thinkers and generally known as the "Father of Liberalism."
He influenced Voltaire and Jean-Jacques Rousseau, many Scottish Enlightenment thinkers, as well as the American revolutionaries with his writings.