Hostun was a village in the territory of the Sharur-Daralayaz uezd of the former Iravan governorate, later in the former Keshishkend (Yeghegnadzor) district, and present-day Vayots Dzor province. It was located on the bank of the Alagoz River, between the villages of Alagoz and Hasankend.

The village was solely inhabited by Azerbaijanis: 61 in 1873, 94 in 1886, 126 in 1897, 125 in 1904, 137 in 1914, 146 in 1916 and 58 Azerbaijanis in 1919 (after the Armenian agression in 1918). The Azerbaijanis were attacked, massacred or ousted from the village by Armenian armed formations in 1918. The Armenians removed from abroad were settled in the village. After the establishment of Soviet power in present- day Armenia, the displaced Azerbaijanis who survived managed to return to the village. Along with the Armenians, the village was inhabited by 29 Azerbaijanis in 1922, 19 in 1926 and 43 in 1931. The village was abolished in 1940. At present, it lies in ruins.

The toponym was coined by combining the Turkic words “os/hos” meaning “the mouth of a river” and “tun” meaning “closed, without free access”.