Flight to Varennes
Defermon was elected (18 April 1789) as a representative of the Third Estate of Rennes to the Estates General (France) and proceeded to become a deputy of the National Assembly from 1789 to 1791. He served as President of the National Assembly 19–30 July 1791, a vital period of time following the Flight to Varennes. During the tenure of the Legislative Assembly he served as president of the Criminal Tribunal of Rennes (1791–1792).