Russian Orthodox Old-Rite Church references on wikipedia
Russian_Orthodox_Old-Rite_Church The Russian Orthodox Old-Rite Church (or Russian Orthodox Oldritualist Church, Russian Orthodox Old-Ritualist Church) () is an Eastern Orthodox Church of the Old Believers tradition, born from a schism within the Russian Orthodox Church following the liturgical reforms of Patriarch Nikon in the second half of 17th century (Old Believers).