Athanasius is also the first person to identify the same 27 books of the New Testament that are in use today; up until his Easter letter, various similar lists were in use. However, his list was the one that was eventually ratified by a series of synods and came to be universally recognized as the New Testament canon.
The Athanasian Creed is a statement of Christian doctrine traditionally ascribed to Athanasius; however most of today's historians agree that in all probability it was originally written in Latin, not in Greek, and thus Athanasius cannot have been the original author. Its theology is closely akin to that found in the writing of western theologians, especially Ambrose of Milan (340 - 397 A.D.). It was designed to overcome Arianism, the focus of much of Athanasius' work, and though not the author it rightly bears his name.