The Nicene Creed (Latin: Symbolum Nicaenum) is the creed or profession of faith that is most widely used in Christian liturgy. It is called Nicene because, in its original form, it was adopted in the city of Nicaea by the first ecumenical council, which met there in the year 325. The Nicene Creed has been normative for the Anglican Church, the Church of the East, the Eastern Orthodox Church, the Oriental Orthodox churches, the Roman Catholic Church including the Eastern Catholic Churches, the Old Catholic Church, the Lutheran Church and all Protestant denominations, forming the eponymous mainstream definition of Christianity itself in “Nicene Christianity”. The Apostles’ Creed, which in its present form is later, is also broadly accepted in the West, but is not used in the East.
The Nicene Creed was originally issued by the Council of Nicaea, 325 c.e. In it’s earliest form, it was short and ended with the words “And in the Holy Spirit.” The Nicene Creed was revised and expanded at the Council of Constantinople, 451 c.e. In actuality, the form of the creed we use in liturgy today is most properly called the Nicaeo-Constantinopolitan Creed.