The Russian Orthodox Church Outside of Russia, also called Russian Orthodox Church Outside Russia or ROCOR, or Russian Orthodox Church Abroad (ROCA), is a semi-autonomous part of the Russian Orthodox Church (Moscow Patriarchate). Currently, the position of First-Hierarch of the ROCOR is occupied by Metropolitan Nicholas (Olhovsky).
The ROCOR was established in the early 1920s as a de facto independent ecclesiastical jurisdiction of Eastern Orthodoxy, initially due to lack of regular liaison between the central church authority in Moscow and some bishops due to their voluntary exile after the Russian Civil War. These bishops migrated with other Russians to Western European cities and nations, including Paris and other parts of France, and to the United States and other western countries.