Chaumette was born in
Nevers France, 24 May 1763, into a family of shoemakers who wanted him to enter the Church. However he did not have a vocation and instead sought his fortune as a cabin boy. After only reaching the rank of helmsman, he returned to Nevers to study his main interests,
botany and science.
 He also studied surgery and made a long voyage in the company of an English doctor, serving as his secretary. He then became surgeon to the Brothers of Charity at Moulins.
 Chaumette studied
medicine at the University of Paris in 1790, but gave up his career in medicine at the start of the Revolution. Chaumette began his political career as member of the
Jacobin Club editing the progressive Revolutions de Paris journal from 1790.
 His oratory skills proved him a valuable spokesperson of the
Cordelier Club, and more importantly, the
sans-culotte movement in the
Parisian neighbourhood Sections. In August 1792 Chaumette became the Chief Procurator of the
Commune of Paris; on 31 October 1792 he was elected President of the Commune and was re-elected in the Municipal on 2 December of that same year. As member of the Paris Commune during
the insurrection of 10 August 1792, he was delegated to visit the prisons, with full power to arrest suspects.
Presidency of the Commune
His conduct, oratorical talent, and the fact that his private life was considered beyond reproach, all made him influential, and he was elected president of the
Commune, defending the municipality at the bar of the
National Convention on 31 October 1792. Re-elected in the municipal elections of 2 December 1792, he was soon given the functions of
procureur of the Commune, and contributed with success to the enrollments of volunteers in the army by his appeals to the population of
Paris. Chaumette held strong anti-monarchy views. He led a deputation from the Commune and argued before the National Convention that failing to punish Louis XVI for his crimes was causing high prices and the fall of the
 Further, Chaumette held a strong opinion about the fate of
Louis XVI after his fall. He was greatly outspoken in his demand for the king's blood. Chaumette’s thesis was that as long as Louis XVI went unpunished prices would remain high, and shortages and the profiteering that created them, which he assumed to be the work of the royalists, would go unchecked.
Chaumette was also a leading and vocal opponent of the
Girondists. He was one of the instigators of the attacks of 31 May and of 2 June 1793 on the
Girondists. Chaumette and
Jacques Hébert acted as prosecutors on behalf of the Tribunal which tried the Girondists in October 1793.
Chaumette made a leading contribution to establishing the
Reign of Terror. In early September 1793 there was fear and unrest in Paris over prices, food shortages, war and fears of a royalist betrayal. On 4 September Hebert appealed to the sections to join the Commune in petitioning the National Convention with radical demands.
 The next day, led by Chaumette and the mayor of Paris,
Pache, crowds of citizens filled the Convention.
 Chaumette stood up on a table to declare that 'we now have open war between the rich and the poor' and urged the immediate mobilisation of the revolutionary army to go into the countryside, seize food supplies from hoarders and exact punishments on them.
 Robespierre was presiding over the Convention's sessions that day, and Chaumette's demands, together with the shock of the recent betrayal of Toulon to the British, prompted the Convention to decree that 'Terror will be the order of the day'.
Role in the dechristianization of France
Chaumette is considered one of the ultra-radical
enragés of the French Revolution. He demanded the formation of a
Revolutionary Army which was to "force avarice and greed to yield up the riches of the earth” in order to redistribute wealth, and feed troops and the urban populations.
 He is associated much more with his views on the
de-Christianization movement, however. Chaumette was an ardent critic of Christianity, which he charged with consisting of "ridiculous ideas"
 that "have been very helpful to [legitimize] despotism."
 In his views, he was heavily influenced by
Denis Diderot and
Jean Meslier. Chaumette saw religion as a relic of superstitious eras that did not reflect the intellectual achievements of the
Age of Enlightenment. Indeed, for Chaumette "church and counterrevolution were one and the same."
 Thus, he proceeded to pressure several priests and bishops into abjuring their positions. Chaumette organized a Festival of Reason on 10 November 1793, which boasted a
Goddess of Reason, portrayed by an actress, on an elevated platform in the Notre Dame Cathedral.
 Chaumette was so passionately involved in the de-Christianization process that in December 1792 he even publicly changed his name from Pierre-Gaspard Chaumette to
 He stated his reason for changing his name that, "I was formerly called Pierre-Gaspard Chaumette because my
god-father believed in the saints. Since the revolution I have taken the name of a saint who was hanged for his republican principles."
 It has been suggested that his criticism was also influenced by the Church's stance on homosexual relations.
Chaumette's ultra-radical ideas on the economy, society and religion set him at odds with
Robespierre and the powerful circle around him and official opinion began to turn against him and the like-minded
Hébertists. In September 1793, Robespierre made a speech denouncing dechristianisation as aristocratic and immoral.
Fabre d'Églantine, himself under suspicion, produced a report for the
Committee of Public Safety, alleging Chaumette's involvement in an anti-government plot, revealed by
Chabot, although Chabot had never named Chaumette himself.
In the early spring of 1794, Chaumette increasingly became target of allegations that he was a counterrevolutionary. Hébert and his associates planned an armed uprising to overthrow Robespierre, but Chaumette, along with
Hanriot, refused to take part.
 When the
Hébertists were arrested on 4 March, Chaumette was originally spared, but on 13 March he too was arrested.
 The other Hébertists were executed on 24 March 1794 but Chaumette was held in prison until found guilty of taking part in the
Luxembourg prison plot along with an unlikely group of co-conspirators including
Lucile Desmoulins, wife of the recently executed
Françoise Hebert, wife of the recently executed Hébert,
Gobel, former Bishop of Paris, and an assortment of other prisoners of various types.
 All of the alleged conspirators were sentenced to death on the morning of 13 April and guillotined that same afternoon.