A different ninth century vertical traveling flag could be the raven banner that was employed broadly because of the Vikings. Though no full illustration of this banner exists, it possibly seems on Northumbrian coins from the start in the century and later, within the 11th century, is probably seen on https://daltoncnwdm.bloggazza.com/31328205/5-tips-about-medeival-flags-you-can-use-today