Fourth Council of Constantinople (869–870)
- Date
- 869–870
- Place
- Constantinople (Hagia Sophia)
What it decided
From 5 October 869 to 28 February 870. It deposed Patriarch Photius and confirmed the restoration of Ignatius. It issued 27 canons in the Latin version (fewer in the Greek), including canon 21 on the order of the patriarchal sees. Attendance was small at first (about 20–25 bishops), reaching 102 at the final session.
- Convoked by
- Emperor Basil I, in agreement with Pope Hadrian II
- Canons
- 27
Who recognises it
Catholic Church (counted as the eighth ecumenical council). Rejected by the Eastern Orthodox Church.