Actually, it depends what you mean by the "start". In 1793, Louis XVI was executed, leaving the French Government in a dire state (this is what caused the wars to start). However, it was not until 1799 that Napoleon became Emperor, and only from then did Napoleon lead the wars.
No consensus exists as to when the French Revolutionary Wars ended and the Napoleonic Wars began. Possible dates include 9 November 1799, when Bonaparte seized power in France in France; 18 May 1803, when Britain and France ended the only period of peace in Europe between 1792 and 1814, and 2 December 1804, when Bonaparte crowned himself Emperor.
Sources in the UK occasionally refer to the nearly continuous period of warfare from 1792 to 1815 as the Great French War, or as the final phase of the Anglo-French Second Hundred Years' War, spanning the period 1689 to 1815.
(Second answer from wikipedia.org)
The time period of the Napoleonic Wars was 1803 to 1815.
Henry Clinton - Napoleonic Wars - was born in 1771.
Portuguese Legion - Napoleonic Wars - was created in 1808.
The Napoleonic Wars ended with Napoleon's exile to St. Helena after the Battle of Waterloo.
Napoleonic Wars
The time period of the Napoleonic Wars was 1803 to 1815.
Henry Clinton - Napoleonic Wars - died in 1829.
Henry Clinton - Napoleonic Wars - was born in 1771.
Portuguese Legion - Napoleonic Wars - was created in 1808.
German campaign - Napoleonic Wars - happened in 1813.
The French Republican Wars and the Napoleonic Wars.
The French Revolutionary Wars and the Napoleonic Wars.
1803
From 1803 to 1815.
The Napoleonic Wars ended with Napoleon's exile to St. Helena after the Battle of Waterloo.
Napoleonic Wars
There were a series of Wars in the Napoleonic period. The First one began in 1803, and the last one ended in 1815.