08-18-2010, 04:13 PM
Transverse crests do appear in a few reliefs that are from the Early Principate and before. I reference the frieze near the Capotiline Hill. I am not sure of the date of the tombstone of T Claudius Severus. Cresting seems to disappear from the rank and file by the time of the Dacian Wars, and cross-bracing is seen from then on, although there is evidence the cresting of cross-braced helmets in the third century. A third century tombstone, that of Severius Acceptus found near Instanbul, has been considered to be that of a Centurion due to the presence of greaves. This tombstone does display the "Attic". However, since greaves have been found to more widly used that previously thought, this interpretation may be brought into question.
Ralph
Ralph