di oc ese ) ▁of ▁the ▁Ser bian ▁Orth odox ▁Church ▁in ▁the ▁Sy rm ia ▁( S rem ) ▁region , ▁Ser bia . ▁Most ▁of ▁the ▁e par chy ▁is ▁in ▁the ▁autonom ous ▁province ▁of ▁V oj vod ina , ▁and ▁it ▁also ▁includes ▁a ▁small ▁south - e astern ▁part ▁of ▁Sy rm ia ▁within ▁the ▁city ▁limits ▁of ▁Bel grade , ▁as ▁well ▁as ▁some ▁West ▁Sy rm ian ▁par ishes ▁in ▁the ▁border ▁region ▁of ▁Cro atia . ▁The ▁seat ▁of ▁the ▁e par chy ▁is ▁at ▁S rem ski ▁Kar lov ci . ▁Since ▁ 1 9 8 6 , ▁the ▁dioc es an ▁bishop ▁is ▁Vas il ije ▁V adi ć . ▁ ▁History ▁ ▁The ▁E par chy ▁of ▁S rem ▁is ▁one ▁of ▁the ▁oldest ▁ecc les iast ical ▁institutions ▁in ▁this ▁part ▁of ▁S out he astern ▁Europe . ▁The ▁Bishop ric ▁of ▁S irm ium ▁was ▁an ▁important ▁ecc les iast ical ▁center ▁of ▁the ▁late ▁Roman ▁Empire ▁in ▁the ▁ 4 th ▁and ▁ 5 th ▁centuries . ▁The ▁bishop ric ▁col lapsed ▁after ▁ 5 8 2 ▁when ▁ancient ▁S irm ium ▁was ▁finally ▁destroyed ▁by ▁Av ars . ▁▁ ▁After ▁the ▁Christian ization ▁of ▁the ▁S lav s , ▁the ▁e par chy ▁was ▁rev ived , ▁and ▁from ▁ 1 0 1 8 ▁it ▁belonged ▁to ▁the ▁Eastern ▁Orth odox ▁Arch bishop ric ▁of ▁O hr id . ▁During ▁the ▁late ▁Middle ▁A ges , ▁the ▁region