Prokopije or Procopius was an Austro-Hungarian cleric of the Romanian Orthodox and Serbian Orthodox churches who ultimately served as the latter's Patriarch at Karlovci. He was born in the Banat as a subject of the Austrian Empire, his ethnic affiliations alternating between the Serb and Romanian communities. Ivačković's early life was spent in Serbian Orthodox institutions, and he was seen as a Serb loyalist before he became Bishop of Arad. During the 1860s, he expressed support for Romanian nationalism, primarily as a founder of the National Aradian Association for Romanian Popular Culture. He backed Andrei Șaguna's bid to set up the Romanian-centered Metropolis of Transylvania, becoming its suffragan bishop; during the Serb–Romanian church partition, he extended the Arad Bishopric south into the Banat.

The Patriarchate of Karlovci or Serbian Patriarchate of Sremski Karlovci, was a patriarchate of the Eastern Orthodox Church that existed between 1848 and 1920. It was formed when the Metropolitanate of Karlovci was elevated to the rank of patriarchate. The Patriarchate of Karlovci nominally existed until 1920, when along with several other Eastern Orthodox jurisdictions in the defunct Austro-Hungarian Empire, as well as the Metropolitanate of Cetinje, it was merged with the Metropolitanate of Belgrade to form the united Serbian Orthodox Church. The seat of the Patriarchate was in Karlovci.