Mirabeau and Abbé Sieyès were two important personalities during the French Revolution. They played significant roles in the revolution and their ideas influenced the course of the revolution. Let us discuss their roles in detail.

Mirabeau
Mirabeau was a representative of the Third Estate in the Estates General. He was a gifted orator and one of the most prominent figures of the early revolution. Some of his major contributions are:

- He proposed the abolition of feudalism, which was a significant step towards the liberation of the oppressed classes.
- He demanded the establishment of a constitutional monarchy, which would limit the powers of the king and grant more rights to the people.
- He supported the Declaration of the Rights of Man and Citizen, which declared that all men were born free and equal and had the right to liberty, property, and security.

Abbé Sieyès
Abbé Sieyès was a prominent member of the National Assembly and a key figure in the drafting of the Constitution of 1791. Some of his major contributions are:

- He wrote the famous pamphlet "What is the Third Estate?" which argued that the Third Estate, which comprised the common people, was the most important estate in society, and that it should have equal rights with the other two estates.
- He proposed the formation of the National Assembly, which was the first step towards the establishment of a constitutional monarchy.
- He played a crucial role in the drafting of the Constitution of 1791, which established a constitutional monarchy and granted more rights to the people.

Conclusion
Mirabeau and Abbé Sieyès were two important figures of the French Revolution who contributed significantly to the establishment of a constitutional monarchy and the liberation of the oppressed classes. Their ideas influenced the course of the revolution and laid the foundations of modern democracy.

They protruded the ideas of nationalism and equality as they were one of them main representatives of Third estate and followed national assembly.