(1689-1755) Enlightenment thinker from France who wrote a book called, The Spirit of the Laws in 1748. In his book, Montesquieu describes what he considers to be the best government. He states that government should divide itself according to its powers, creating a Judicial, Legislative, and Executive branch. Montesquieu explained that under this system each branch would Check and Balance the others, which would help protect the people's liberty.