The two wings of the Church came into focused conflict at the Synod of Whitby in 664, called by the regional King Oswiu.13 They clashed over two apparently superficial issues: (1) By their contrasting method of calculating the date for Easter, the Celtic churches were often celebrating Easter on a different date than Rome prescribed; and (2) the hairstyle of the Celtic priests and monks contrasted with the "tonsure" of Roman priests and monks.
