The term “Niceno-Constantinopolitan Creed” was first used in the 17th century (by J. B. Carpzov I) with a view to fixing the key dates in the development of what is commonly called the Nicene Creed (Confessions and Creeds). Early church tradition found in this creed a confirmation and expansion of the dogmatic decision made at the Council of Nicaea (325) and linked it to what took place when the “Synod of 150 Fathers” met at Constantinople in 381.

Neo-Protestantism (e.g., A. von Harnack [1851–1930]; Protestantism), following the research of F. J. A. Hort (1828–92), questioned …