Abstract
Eucharistic ecclesiology, which underlies Orthodox ecclesiology, has at its core a communion between the Local Churches. In practice, it manifests itself in the mutual recognition between the various autocephalous and autonomous Churches. The head of a separate Church of the Universal Orthodoxy during the Liturgy commemorates all the leaders of other self-governing Orthodox Churches. Communion through the sacraments also happens between the Churches, namely, unity is manifested through communion in the Eucharist. The teachings of the early Christian author, Ignatius Theophoros, Bishop of Antioch, formed the basis of the local structure of the Church. The main principle of his theology is the unity of all the faithful of a certain territory around his bishop, that is, the common communion of all Christians in the Eucharist, which only the bishop of that territory is entitled to fulfill. The bishop, in turn, is a member of the "universal bishopric" and through it the local church is part of the one universal Church.