The First Council of Constantinople was the second ecumenical council of the Christian Church, held in Constantinople in 381 AD. Emperor Theodosius I called the council with the goal of unifying the church's thought: the council condemned Arianism and other sects as heresy, renewed diocesan and patriarchal limits for bishops, limited the ability to accuse bishops of wrongdoing. It also amended the earlier Nicene Creed, adding more declarations to the creed. The council marked the final defeat of Arianism, the heretical teachings of Arius, the third century mystic. All his books were ordered destroyed and Arianism was made a crime in 326 AD, but his teachings about the nature of Christ were appealing to many, including the Goths. Then, however, the thinking was suppressed.