The Council of Constantinople, held in 381 AD, was the second ecumenical council of the Christian Church, primarily convened to address the Arian controversy and to further clarify the nature and role of the Holy Spirit within the doctrine of the Trinity. This council affirmed the Nicene Creed, expanding it to include explicit statements about the Holy Spirit, thereby reinforcing its position in Christian theology and establishing essential beliefs that would shape later Roman Catholic doctrine.
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