The four causes of French revolution:social cause :the Fench society was divided into three estates -a. Clergyb. Nobelsc. CommonersThe first two estates were exempted from taxes and enjoyed many privileges by birth but on the other hand commoners lived a very hard life.They have to pay all the types of taxes.2. Political cause : the king Louis xvi and queen Marie Antoinette led a luxurious life.The whole administration was corrupt and people were tired of such rotten system and wanted a change.3. Financial problems: Long years of war had drained the wealth of France.Added to this the king had to pay 2 billion LIVRES as loan ,and because of bad harvest the prices of grains rose high and many people were not able to afford it and this led to crisis of subsistence.4. Role of philosophers : The philosophers like john locke , Rousseau , Montesquieau played important role in french revolution .These people had given ideas for the betterment of the society. There ideas got popularised among the masses .As the result the middel class emerged and started seeking their rights.