It comprises historical city of Slezská Ostrava as well as market town of Hrušov and villages Antošovice, Heřmanice, Koblov, Kunčice, Kunčičky and Muglinov.
Ostrava was first mentioned in the document of Pope Gregory IX issued for Benedictine abbey in Tyniec in 1229 as Ostrawa.
[1] Politically it belonged then to the Duchy of Opole and Racibórz, however it lay on the river Ostravice along which a border between the Silesia and Morava was first regulated in 1261.
[3] Since 1290 it belonged to the Duchy of Teschen, which in 1327 became a fee of Kingdom of Bohemia, which after 1526 became part of the Habsburg monarchy.
It was taken from them (as one from around fifty buildings in the region) by a special commission and given back to the Roman Catholic Church on 26 March 1654.