Deaths on December 31

Jean-François Marmontel, French historian and author (b. 1723)

Jean-François Marmontel (11 July 1723 – 31 December 1799) was a French historian, writer and a member of the Encyclopédistes movement.

9 Jan

William Pitt the Younger
British Prime Minister William Pitt the Younger introduces an income tax of two shillings to the pound to raise funds for Great Britain's war effort in the Napoleonic Wars.
4 May

Battle of Seringapatam
Fourth Anglo-Mysore War: The Battle of Seringapatam: The siege of Seringapatam ends when the city is invaded and Tipu Sultan killed by the besieging British army, under the command of General George Harris.
27 May

Battle of Winterthur (1799)
War of the Second Coalition: Austrian forces defeat the French at Winterthur, Switzerland.
25 Jul

Battle of Abukir (1799)
At Abu Qir in Egypt, Napoleon I of France defeats 10,000 Ottomans under Mustafa Pasha.
19 Sep

Battle of Bergen (1799)
French Revolutionary Wars: French-Dutch victory against the Russians and British in the Battle of Bergen.