In the Orthodox Church, a hierarch (ruling bishop) holds uncontested authority within the boundaries of his own diocese; no other bishop may perform any sacerdotal functions without the ruling bishop's express invitation. The violation of this rule is called "eispēdēsis" (Greek: εἰσπήδησις, "trespassing", literally "jumping in"), and is uncanonical. Ultimately, all bishops in the Church are equal, regardless of any title they may enjoy (Patriarch, Metropolitan, Archbishop, etc.). The role of the bishop in the Orthodox Church is both hierarchical and sacramental.