Circassia, also known as Zichia, was a country and a historical region in the North Caucasus. Located along the northeastern shore of the Black Sea, it was conquered by the Russian Empire during the Russo-Circassian War (1763–1864), after which approximately 90% of the Circassian people were either exiled or massacred in the Circassian genocide.

The Russo-Circassian War, also known as the Russian invasion of Circassia, was the invasion of Circassia by Russia, starting in 1763 (O.S) with the Russian Empire assuming authority in Circassia, followed by the Circassian refusal, and ending 101 years later with the last army of Circassia defeated on 21 May 1864 (O.S), making it exhausting and casualty-heavy for both sides. The Russo-Circassian War was the longest war both Russia and Circassia have ever fought and the longest war in the Caucasus region.