Mirabeau's death prompted a desire to honor the great men who forged the Revolution. On April 4, 1791, the Sainte-Geneviève church was transformed into the "Pantheon of great men" with the following inscription on the building's pediment: "To its great men, a grateful nation."
And yet, in 1792, when an iron chest was discovered at the Tuileries Palace containing correspondence between Louis XVI and, among others, Mirabeau, the latter was immediately discredited and removed from the Pantheon.*
* Probably just jealous of his womanising, I'd imagine.