The most significant of these early decisions was that between the Homoousian doctrine of Athanasius and Eustathius (which became Trinitarianism) and the Heteroousian doctrine of Western and Eastern churches continued to consider themselves uniquely "orthodox" and catholic.
The most significant of these early decisions was that between the Homoousian doctrine of Athanasius and Eustathius (which became Trinitarianism) and the Heteroousian doctrine of Arius and Eusebius (called Arianism). Following the 1054 Great Schism, both the Western and Eastern churches continued to consider themselves uniquely "orthodox" and catholic.