On what dates and what people were required to quit France by decree of the Legislative Assembly?
EDIT 21 April 2018
The following details were added by the OP in comments to an answer below
I have a record of birth from College of Arms London where the father Charles Montboissier Beaufort Visconti de Canillac and Philippe François D’Albignac de Castelnau Bishop of Angouleme (now residing at Richmond in Surrey) we’re both compelled to quit France by a Decree of the Legislative Assembly of that country. It appears though that Charles may have returned to France by 1794.
Charles is paternal cousin of Philippe Claude Montboisser, But Charles own details are just Charles de Montboissier-Beaufort-Canillac Marquis de Canillac (1812) Prince romain et de Montboissier-Beaufort-Canillac (1st, 1822) Vicomte de Mont......, Titre par le Pape Pie V11, Commandeur de l'Ordre Royal Militaire de St Louis, Officier de la Legion d'Honneur. Born May 1753 Chateau de Beaumont Agonges, 03002, Allier, Auvergne France. Died 21 May 1836 Paris. Contre-Amiral. Father was Edouard de Mont.... died 1764 and mother Anne Elisabeth de Troussebois Dame de Beaumont-Lafayette.