Linked from
The 17 pages that link to First Council of Constantinople, each with the reason it gives.
First Council of NicaeaRelated: It extended the settlement beyond the questions resolved at Nicaea.
Theodosius IRelated: Theodosius convened the council to consolidate Nicene doctrine in the empire.
BithyniaRelated: Its decisions extended the theological settlement associated with nearby Nicaea.
God the SonRelated: It reinforced the Trinitarian framework in which the Son is understood.