I'm in discussion with a number of well known historians around the purpose of the Late Roman Draco standard, and its colour. I would welcome the thoughts of others on this topic please.
I've put the below on various sites as a starting point for debate-
'I've read a number of articles etc about the Late Roman 'Draco' standard, and
I've never been entirely satisfied by the explainations given about its purpose.
My own thoughts are that the Draco actually represented the presence either
physically or by its presence alone, of the Emperor.
My stating this is from an examination of Ammianus. In the book where he
describes the attempted ursurpation by Silvanius, the Germanic troops who
'raised him to the purple', tore the purple from the draco standards to drap
around his shoulders in imitation of the purple cloak worn by the Emperor. There
are other books in Ammianus where he describes the draco as being purple
coloured.
Also there is another passage that describes all the draco's as being purple in colour.
Here are the relevant passages-
15.5.16:
... cultu purpureo a draconum et vexillorum insignibus ...'... by the purple adornment from the signs of dragon standards and flags ...'
16.10.7:
... purpureis subtegminibus texti circumdedere dracones hastarum aureis gemmatisque summitatibus inligati, hiatu vasto perflabiles et ideo velut ira perciti sibilantes caudarumque volumina relinquentes in ventum.'... the dragons, sewn from purple covers and placed on the gilded and jewel-studded tips of spears, letting wind through an enormous opening and in that way hissing as if they had been aroused in anger and the bodies of their tails flowing in the wind.'
This indicated to me that all draco standards were purple in colour, and
therefore could not have anything to do with being a unit standard. Rather, it
suggests to me that the draco must be a representation of something that was
important, because it was purple and therefore the colour only an Emperor could
wear (there are many examples of those during the Late Roman time caught with
purple coloured items and being executed for having them). The only thing that
was important enough to be represented both by the figure of a dragon, and also
in Imperial colours can only one thing, the Emperor himself.
My thoughts are that every unit had a purple coloured draco that was the
representation of the Emperor, whether or not he was actually with the army.
This may have been to raise moral (The Emperor may not be here physically, but
he is still watching over you), but to also put fear into their opponents who
will never really know if the Emperor is present with the army or not.
What are your thoughts on this?'