Answer:
Abbe Emmanuel Sieyes
Step-by-step explanation:
Abbe Emmanuel Sieyes was a roman catholic Frenchmen who is well known for his political theories during the French revolution. Although he belonged to First Estate, he actively fights for the rights of the third state which he considered as the true foundation of France. His pamphlet "What is the Third Estate" in 1789 helped the Estate General to transform into National assembly. This pamphlet became the manifesto of the French Revolution. He got universal attention for his contribution to the nascent social science.