Zagore (Bulgarian: Загоре, [zəˈɡɔrɛ]); also Zagorie, Zagora, Zagoria) was a vaguely defined medieval region in Bulgaria. Its name is of Slavic origin and means "beyond [i.e. south of] the [Balkan] mountains". The region was first mentioned as Ζαγορια in Medieval Greek (in an Old Bulgarian translation it was rendered as Загорїа) when it was ceded to the First Bulgarian Empire by the Byzantine Empire during the rule of Tervel of Bulgaria in the very beginning of the 8th century (Byzantine–Bulgarian Treaty of 716).