The participating churches understand themselves as parts of the one, holy, catholic and apostolic church confessed in the Nicene Creed. The links of their community are (1) the faith of the ancient undivided church, renewed by the Protestant Reformation of the 16th century, (2) the celebration of Baptism and Eucharist according to the Bible and the ecumenical tradition, (3) the uninterrupted continuity of the historic episcopate (considered lacking in the Lutheran churches of Germany which therefore stay apart).
The churches involved are the Church of Ireland, the Anglican churches in Great Britain, the Lutheran national churches of the Nordic countries and the Lutheran churches of the Baltic countries of Estonia and Lithuania. Later negotiations brought the Anglican Communion churches of the Iberian Peninsula into the agreement.
Signatories of the Porvoo Communion:
Other churches involved as observers: