Note 021

As counts of Vexin, the kings of France were the vassals and advocates of the monastery of St. Denys. The saint's peculiar banner, which they received from the abbot, was of a square form, and a red or flaming colour. The oriflamme appeared at the head of the French armies from the xiith to the xvth century, (Ducange sur Joinville, Dissert. xviii. p. 244 - 253.)
The History Of The Decline And Fall Of The Roman Empire Fall In The EastChapter 59