Events on May 15 in history

Diego Marín Aguilera flies a glider for "about 360 meters", at a height of 5-6 meters, during one of the first attempted manned flights.

Diego Marín Aguilera (1757–1799) was a Spanish inventor who was an early aviation pioneer.

21 Jan

Louis XVI of France
After being found guilty of treason by the French National Convention, Louis XVI of France is executed by guillotine.
23 May

Flanders Campaign
Battle of Famars during the Flanders Campaign of the War of the First Coalition.
23 Jul

Mainz
Kingdom of Prussia re-conquers Mainz from France.
27 Aug

Siege of Toulon
French Revolutionary Wars: The city of Toulon revolts against the French Republic and admits the British and Spanish fleets to seize its port, leading to the Siege of Toulon by French Revolutionary forces.
5 Sep

French National Convention
French Revolution: The French National Convention initiates the Reign of Terror.