The Kingdom of Artsakh (Armenian: Արցախի թագավորություն), also known as the Kingdom of Syunik-Baghk, is the modern name given to the medieval eastern Armenian state on the territory of Artsakh (present-day Nagorno-Karabakh), Gardman and Gegharkunik. Contempororay sources referred to it as the "kingdom of Aghuank" or "Khachen". The royal house of Artsakh was a cadet branch of the ancient Syunid dynasty and was named Khachen, after its main stronghold. The kingdom emerged when John-Senecherib (Hovhannes-Senekerim) acquired the royal title in 1000. The monarchs of Artsakh maintained an internationally recognized sovereign status, though in the early 13th century they accepted Georgian, then Mongolsuzerainty. They lost the royal title after the assassination of Hasan-Jalal (1214–1261) by the Ilkhanid ruler Arghun Khan, but continued to rule Artsakh as a principality, which from the 16th century comprised five Armenian melikdoms and lasted until the early 19th century. The descendants of the kings of Artsakh played a prominent role in the history of Artsakh as far as the 20th century.
Robert H. Hewsen. "The Kingdom of Arc'ax" in Medieval Armenian Culture (University of Pennsylvania Armenian Texts and Studies). Thomas J. Samuelian and Michael E. Stone (eds.) Chico, California: Scholars Press, 1984. ISBN 0-89130-642-0.