The formation and ecumenical importance of the so-called 'Nicaeno-Constantinopolitanum'
This study presents the doctrinal environment of the Nicaeno-Constantinopolitanum, including its lost Tomus, mentioned by the synodal epistle of 382, in light of which the Creed’s theology ought to be explained. Despite some lacunae, modern scholarship established links between the West (Rome), the Antiochene council of 379 and the ecumenical council of 381. The Fathers’ attempts to find new methods of expressing a pneumatology based on the threefold ὁμοούσια demonstrate that the consubstantiality was meant to be extended to the Spirit.