Second Ecumenical Council
First Council of Constantinople
381 · Constantinople · convened under Theodosius I
Historical context
Convened to settle continuing Arian and Macedonian controversies over the Holy Spirit.
Major decisions
- Affirmed the full divinity of the Holy Spirit.
- Expanded the Nicene Creed into the form recited today (Niceno-Constantinopolitan).
Canons
7 canons on ecclesiastical discipline and the rank of Constantinople.
Long-term impact
Trinitarian dogma is set in its definitive Niceno-Constantinopolitan form.