Explain the role of philosophers in the French Revolution of 1789.
The role of philosophers in the French Revolution of 1789 was:

In Two Treaties of Government, Locke sought to refute the doctrine of the divine and absolute right of the monarch.
Rousseau carried the idea forward, proposing a form of government based on a social contract between people and their representatives.
In the spirit of the laws, Moritesquieu proposed a division of power within the government between the legislative, the executive, and the judiciary.
The ideas of these philosophers were discussed intensely in salons and coffeehouses and spread among people through books and newspapers.
The patriotic song Marseillaise was composed by poet Roget de Lisle. It was sung for the first time by volunteers from Marseilles as they marched into Paris, hence its name. The Marseilles are now the national anthem of France.