→Lack of liturgical continuity
Fr. John Shaw of ROCOR also argues the little-known Liturgy of St. Peter, a [[liturgy]] identical to that of the Byzantine rite with the ancient Gregorian canon in its place, never fell out of use within Orthodoxy. The Old Believers and others celebrated this, explicitly endorsing the validity of the Western canon. At present, the historicity of this assertion is not universally accepted.
Further, the now fairly well-known [[Liturgy of St. James]] once fell out of use throughout most of the Church and has now been revived in many places to be celebrated on [[October 23]].