In what year was the Council of Constantinople I convened?

The Council of Constantinople I was convened in 381 AD as the second ecumenical council of the early Christian Church. This council played a significant role in addressing various theological disputes that arose after the Council of Nicaea in 325 AD. It focused heavily on the nature of the Holy Spirit and the role of the Nicene Creed, expanding its focus to counter heretical views such as Arianism. The council affirmed the divinity of the Holy Spirit, emphasizing the concept of the Trinity, which has become a cornerstone of Christian doctrine. It also established the authority of the episcopate in the Church, solidifying the structure and governance that would influence later councils and church organization.