The first Serbian bishopric was founded at the political center at Ras, near modern Novi Pazar on the Ibar river. The initial affiliation is uncertain; it may have been under the subordination of either Split or Durazzo, both then Byzantine. The early church of Saint Apostles Peter and Paul at Ras, can be dated to the 9th–10th century, with the rotunda plan characteristic of first court chapels. The bishopric was established shortly after 871, during the rule of Mutimir, and was part of the general plan of establishing bishoprics in the Slav lands of the Empire, confirmed by the Council of Constantinople in 879–880. The Eparchy of Braničevo was founded in 878 (as a continuation of Viminacium and Horreum Margi).