Blagaj is a small town in southern Bosnia and Herzegovina. Blagaj is located only 7 km south from Mostar. During the antiquity Blagaj had both Illyrian fort and Roman Castrum.

During the time of the Byzantine emperor Justinian several fortified towns were built in the area. Blagaj is first mentioned in Constantine Porphyrogenitus's work "De Administrando Imperio " ( The management of empire ) as " Bona " , part of Zahumlje

During the era of Stefan Nemanja, Zahumlje was under the domination of Raska state, and at the end of the 12th century prefect Jurko built the church of St.Kuzman and Damian in the region.

Zahumlje become a part of the Bosnian state in the 14th century during the Bosnian Ban Stjepan II Kotromanić

Blagaj belonged to Bišće area, and it was popular as a residential place of Bosnian rulers and nobles from Hranić and Kosača families.Blagaj was first mentioned in 1423, during the Ottoman Empire as the seat of Blagaj vilayet, and later kadiluk, and it was said it was divided into a few bigger neighborhoods. At the time the town had seven mosques , two inns , four musafirhanas , madrasa, two religious schools, dervish sanctuary, four stone bridges over Buna, one over Bunica, and two on the smaller underground karst river Posrt, and seven mills with twenty-eight grinders.

During the Austro-Hungarian period both Catholic Church (1908) , and the Orthodox Church in (1893) were constructed.