Jacques Pierre Brissot

In February 1788, Brissot founded the anti-slavery Society of the Friends of the Blacks. With the outbreak of the revolution in July 1789, he became one of its most vocal supporters. As a member of the Legislative Assembly, Brissot advocated for war against Austria and other European powers in order to secure France's revolutionary gains, which led to the War of the First Coalition in 1792. He voted against the immediate execution of Louis XVI which made him unpopular with the Montagnards. He was friendly with Jean-Paul Marat, but in 1793 they were the greatest enemies.
On 3 April 1793, Maximilien Robespierre declared in the Convention that the whole war was a prepared game between Dumouriez and Brissot to overthrow the First French Republic. Conflicts with Robespierre, who accused him of royalism, eventually brought about his downfall. On 8 October, the Convention decided to arrest Brissot. Like Madame Roland and Pétion, Brissot was accused of organising (or taking part in) conspicuous dinners. At the end of October 1793, he was guillotined along with 28 other Girondins by Charles-Henri Sanson. Provided by Wikipedia