In 301 AD, Armenia became the first nation to adopt Christianity as a state religion, establishing a church that still exists independently of both the Catholic and the Eastern Orthodox churches, having become so in AD 451 as a result of its excommunication by the Council of Chalcedon. The Armenian Apostolic Church is a part of the Oriental Orthodox communion, which must not be confused with the Eastern Orthodox communion. During its later political eclipses, Armenia depended on the church to preserve and protect its unique identity. From around 1100 to 1350, the focus of Armenian nationalism moved south, as the Armenian Kingdom of Cilicia, which had close ties to European Crusader States, flourished in southeastern Asia Minor until conquered by Muslim states.
Between the 4th and 19th centuries, Armenia was conquered and ruled by, among others, Georgians, Persians, Byzantines, Arabs, Mongols, and Turks. For a brief period from 1918 to 1920, in the aftermath of World War I it was an independent republic. In late 1920, the communists came to power following an invasion of Armenia by the Red Army, and in 1922, Armenia became part of the Transcaucasian Federative Soviet Socialist Republic. In 1936, it became the Armenian Soviet Socialist Republic. Armenia declared its independence from the Soviet Union on September 21, 1991.
See also: Armenian Holocaust
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