the town has a mixed population of bulgarians and turks, with an orthodox church and a mosque being present. isperih emerged in 1545 at the place of a medieval settlement, with the earliest known traces of human presence in the area dating from the bronze age. the village was first mentioned as "kemallar" in an ottoman tax register from 1573 and was renamed "isperih" in 1934, becoming a town on 31 january 1960.