Given the cross-fertilization of texts and traditions in the early centuries of Christianity in the Mediterranean world, it is not surprising to find elements of influence from one geographic area on another. In the present essay, Anton Baumstark surveys several Christmas texts from the Roman Antiphonarius Officii in an attempt to find evidence of Byzantine influence. Baumstark focuses on poetic works from the Byzantine tradition, and not surprisingly finds evidence of an Eastern influence on the Western tradition.