<P> As a result of the spike in public violence and the political instability of the constitutional monarchy , a party of six members of France 's Legislative Assembly was assigned the task of overseeing elections . The resulting Convention was founded with the dual purpose of abolishing the monarchy and drafting a new constitution . The Convention 's first act , on 10 August 1792 , was to establish the French First Republic and officially strip the king of all political powers . The King , by then a private citizen bearing his family name of Capet , was subsequently put on trial for crimes of high treason starting in December 1792 . On 16 January 1793 he was convicted , and on 21 January , he was executed by guillotine . </P>
who abolished the monarchy and declared france a republic
France 's Legislative Assembly