1800 treaty between France and the Ottoman Empire

Claddagh ring — Irish tradition symbol

18th century — time period between January 1, 1701, and December 31, 1800

1800 naval battle of the Quasi War

1800s — decade of the Gregorian calendar (1800–1809)

18th century war in New Zealand

1800 United States presidential election — 4th quadrennial U.S. presidential election

Part of the French Revolutionary Wars, the Siege of Malta (1798–1800)

1800 battle during the French Campaign in Egypt and Syria

1800 minor naval engagement during the French Revolutionary Wars

The creation of Septinsular Republic : the first autonomous Greek State