Thanks Lee for the link to this discussion of
London helmets. Very interesting, although I don't think that the bands seen on the
London helmets have anything to do with the royal band that
Constantine introduced after becoming sole emperor in late 324. That band very clearly alludes to the band of Alexander and the hellenistic rulers, of which
Constantine apparently wanted to see himself as a successor. He conquered the east and became, in effect, the ruler of what used to be the hellenistic world, and he was well aware of it. Just think of the hellenistic-style "tetradrachms" he issued in 330 (these are discussed in detail in Ramskold and Lenski 2012: Constantinople's Dedication Medallions and the Maintenance of Civic Traditions).
The various bands on the
London coins appear long before he could even think about ruling in the east. The royal band of
Alexander and his successors was used by
Constantine in the traditional fashion, around the
head, not on the helmet.
I am awaiting the arrival of the 2012 book by A.
Lichtenberger / K.
Martin / H.-H. Nieswandt / D. Salzmann (Hrsg); Das Diadem der hellenistischen Herrscher. There is surely a lot of very interesting information it it, but I don't know if
Constantine is discussed.
Lars Ramskold