Most Vlachs of Eastern Serbia are Orthodox Christians who had belonged to the Serbian Orthodox Church since the medieval times. The Vlachs celebrate the ("hospitium", in Latin), called in Serbian "praznik" or "slava" as a family's annual ceremony and veneration of their patron saint that is a common tradition with Orthodox Serbs. Some Vlach political organizations also have "slava". Stefan Nemanja is one of venerated patron among Vlach because he mentioned Vlach people in Hilandar monastery constitution including 170 Vlach who helped a monastery. Serbian orthodox church in Cetinje is called Vlach church – "Vlaška crkva" – as remembrance on Vlachs who helped to built church. According to remembrance Vlach Ivan Borojev - built the original Vlach church in Cetnije after coming from Old Vlach country that was in area around mountain Zlatibor.