World History Illustrated Timeline By Coby Heaton Jan 1, 1651 Hobbes Publishes Leviathan Jan 1, 1690 Locke Published Two Treatises On Government Jan 1, 1748 Montesquieu Published The Spirit Of The Laws Jan 1, 1762 Rousseau Published The Social Contract, Emile Jan 1, 1764 Beccaria Published On Crimes And Punishments