The First Council of Constantinople, convened in 381 AD, was the second ecumenical council of the Christian Church that aimed to address and clarify issues regarding the nature of the Holy Spirit and the ongoing Arian controversy. This council played a crucial role in shaping Trinitarian theology by affirming the divinity of the Holy Spirit and solidifying the Nicene Creed established at the First Council of Nicaea in 325 AD, thus further developing foundational Christian beliefs about the Trinity.
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