Bostan refers to two sites: Bostan Köy / Marangeçele, which was an isolated late antique, Byzantine, and Armenian settlement (probably a monastery), and Bostan / Ergenuşaği a fortress tentatively identified with the medieval Copitar [Arm: Kopitaṙ, Gobidar, Itl: Colidara], which was built by Armenians to guard the roads from Sis and the Vale of Karsantı to Vahga and Cappadocia.

Ref: Fortifications, pp. 93-98; Settlements, pp. 218-219; Châteaux, pp. 75-77; Tamrut, pp. 105-120; Drazark, forthcoming.

(Site description written and references compiled by Robert W. Edwards, additional identification with Kopitaṙ/Copitar by Jirair Christianian)