More Merovingian- Kingdom of Soissons

[Caballo]

I recall reading somewhere that the troops of the Kingdom of Soissons marched under standards similar to the old Romans- does anyone know where this reference is sourced? I can't find it Gregory ot Tours though he mentions Syragius and his father Aegidius- and generally , the Kingdom of Soissons seems to be a "last stand"of Romanitas in Northern France.