Nicene-Constantinopolitan Creed

Nicene Creed
Created	325
Author(s)	First Council of Nicaea

The Niceno–Constantinopolitan Creed
Created	381
Author(s)	First Council of Constantinople

The Nicene Creed (Greek: Σύμβολον τῆς Νικαίας or, τῆς πίστεως, Latin: Symbolum Nicaenum) is a Symbol of faith widely used in Christian liturgy. It is called Nicene /ˈnaɪsiːn/ because it was originally adopted in the city of Nicaea (present day Iznik, Turkey) by the First Council of Nicaea in 325. In 381, it was amended at the First Council of Constantinople, and the amended form is referred to as the Nicene or the Niceno-Constantinopolitan Creed.

The Oriental Orthodox and Assyrian churches use this profession of faith with the verbs in the original plural ("we believe") form, but the Eastern Orthodox and Roman Catholic churches convert those verbs to the singular ("I believe"). The Anglican and many Protestant denominations generally use the singular form, but sometimes use the plural.

The Apostles' Creed is also used in the Latin West, but not in the Eastern liturgies. On Sundays and some other days, one or other of these two creeds is recited in the Roman Rite Mass after the homily. The Nicene Creed is also part of the profession of faith required of those undertaking important functions within the Catholic Church.

...
Wikipedia