When most of the deputies in Paris met in the salon of Casimir Pierre Périer, Mauguin spoke up for a protest against the press censorship ordinances.

During the meeting at the home of Pierre-François Audry de Puyraveau, with the windows open and the courtyard filled with a noisy and animated crowd, Mauguin said, "This is a revolution we have to lead.

When François Guizot read a draft protest, Mauguin was among those who objected to including the terms "loyalty to the king" and "advisers false to the intentions of the monarch" while blood was flowing in Paris.

[2] On 29 July 1830 the deputies who had remained in Paris met at Lafitte's house and named an interim Municipal Commission composed of Jacques Laffitte, Casimir Pierre Périer, Georges Mouton, Auguste de Schonen, Pierre-François Audry de Puyraveau and François Mauguin.

Mauguin did name Bavoux Commissioner of Police and Chardel postmaster, proclaimed that the French monuments were under the protection of the people and issued various circulars to address urgent needs.

They also admitted a popular deputation that insisted, unsuccessfully, on the need to consult the nation and not to establish authority without first ensuring safeguards for civil liberty.

The commission ordered a levy of twenty battalions of the Mobile Guard, proclaimed the deposition of Charles X, and organized the expedition that forced the king to flee from his residence at Rambouillet.

After the death of General Lamarque his interest turned to the colonies, where he surprised the democrats by his support for the French settlers and opposition to abolition of slavery.

He was accused of having become involved in dubious speculations, of having made unexplained use of secret funds for the colonies, and of having privately bought the journal Commerce and then resold it to Prince Louis Bonaparte.

He supported the expedition to Rome in which the short-lived Roman Republic was suppressed and Pope Pius IX was restored to his temporal powers.

[2] On 27 December 1850, when a creditor was prosecuting him, Mauguin was arrested and taken to the prison in the rue de Clichy, where he was held by a decision of the Civil Court of the Seine.

The Assembly was outraged by this violation of the immunity of its members, and passed a resolution to have a line battalion force his release.