The Council of Constantinople (AD 381): Necessary to address other Christological heresies

Douglas Kuiper examines the Council of Constantinople (AD 381) and its condemnation of Christological heresies, particularly Sabellianism/modalism, which incorrectly explained how Christ is God while denying the distinct personhood of the Father, Son, and Holy Spirit. This article defends the orthodox understanding of the Trinity against false explanations that emerged even among those who correctly affirmed Christ's divinity. The resource provides historical context and doctrinal clarification useful for understanding early church responses to heretical theology.