Born at Colmar (now in the département of Haut-Rhin), he became president of the local order of lawyers, and in 1789 was elected as a deputy to the Estates-General by the Third Estate of the bailliage of Colmar-Schlestadt.
[1] In the National Constituent Assembly his oratory, legal knowledge and austerity of life gave him much influence.
In July 1791, after the flight of Louis XVI, the constitutional king, Rewbell left the Jacobin Club and joined the Feuillants.
[1] He was elected to the Republic's National Convention in 1792, and was its envoy to the Rhineland, advocating the union of the Electorate of the Palatinate and other territories with France.
[citation needed] A zealous promoter of the Trial of Louis XVI, he was absent on mission at the time of the king's condemnation.