Liberals to the left and Conservatives to the right, Why?

In 1789 the First French National Assembly convened after the Revolution. The assembly was packed with 1177 deputies. As it happened, the liberal or radical members were seated to the left of the speaker, and the conservative members to the right. The practice spread, and the terms left wing and right wing are still used around the world to denote the two political beliefs,
liberalism and conservatism.