4th Century...The Nicene Creed

The Nicene Creed 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 A.D. 325. The Nicene Creed has been normative to the Anglican, Lutheran, and Roman Catholic Eucharistic rite as well as Eastern and Oriental Orthodox liturgies. The Creed is recited in the Roman Rite Mass directly after the homily on all Sundays and Solemnities (Tridentine Feasts of the First Class), and in the Byzantine Rite Liturgy following the Litany of Supplication on all occasions.

It is given high importance in the Anglican Church, Eastern Orthodox Church, Assyrian Church of the East, Oriental Orthodox churches, the Roman Catholic Church including the Eastern Catholic Churches and the Old Catholic Church, the Lutheran Church and most Protestant denominations.
source: Wikipedia
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