creed : Idioms & Phrases

• a creed of unknown origin, which was formerly ascribed to the apostles. It certainly dates back to the beginning of the sixth century, and some assert that it can be found in the writings of Ambrose in the fourth century.

Webster 1913

• See under Apostle, Athanasian, Nicene.

Webster 1913

• noun a Christian profession of faith
  

WordNet

• a formulary, confession, or exposition of faith, formerly supposed to have been drawn up by Athanasius; but this opinion is now rejected, and the composition is ascribed by some to Hilary, bishop of Arles (5th century). It is a summary of what was called the orthodox faith.

Webster 1913

• noun (Christianity) a formal creed summarizing Christian beliefs; first adopted in 325 and later expanded
  

WordNet