He was born in
Brussels,
Austrian Netherlands, where his father - also named Jean Vesque - was Inspector-General of the estates of the Bishop of
Metz, and from 1760 Inspector of Imperial Lotteries, a post in the government of the
Austrian Netherlands. His French mother, Cécilie de Roquilly, came from
Commercy in the department of
Meuse. He went to school in his mother's home town of Commercy, and then attended the faculties of philosophy and law at
University of Louvain. In 1787, he was given a post in the government service in Brussels where he was on the commission charged with reform of ecclesiastical affairs. On the outbreak of the
Brabant Revolution in October 1789 (which occurred simultaneously with the
French Revolution and the
Liège Revolution, the whole Austrian administration sought safety in Luxembourg; because of a lack of horses, Vesque couldn't go, and stayed in
:fr:Treurenberg in Brussels for two months.
Brabant formed the nucleus of the unrecognised
United Belgian States. Vesque eventually arrived in
Trier, where the rest of the government in exile had gathered along with
Philipp von Cobenzl. An Austrian army defeated the Belgian revolutionaries in December 1790; in
the Revolution's aftermath a convention was held at The Hague on 10 December 1790 to decide how to re-establish Austrian rule, at which Vesque was a negotiator. The Liège Revolution was also finally suppressed by Austrian forces in January 1791. His novel
Le Roi Guiot was published in 1791. On 17 March 1793
Archduke Charles, Duke of Teschen became
Governor of the Habsburg Netherlands and Vesque returned to Brussels where - among other functions, he acted as censor of theatres. , with French
observation balloon at top right The peace only lasted a few months before the outbreak of the
War of the First Coalition, which was an attempt by the
Triple Alliance (Prussia, Austria and Britain) to defeat Revolutionary France. France invaded the
Low Countries in 1794. The Austrian administration fled for the second time, and during the evacuation of Brussels Vesque was in charge of the government archives, taking them down the
River Rhine through Holland to
Düsseldorf; thence he went to
Aachen (Aix-la-Chapelle), and continued to
Dillenburg in the
Duchy of Nassau, where his time of service (since 1787) with the Austrian administration came to an end on 31 December 1794. It appears that he was relatively destitute; he had no belongings since everything was in Brussels. An Austrian Army was defeated in 1795 at the
Battle of Fleurus; France formally annexed the
Low Countries, and brought in a government in a typically new French style based on merit rather than parentage (the
French period). ==Exiled émigré==