15thc perception on swallowtail merlons?

[R. Sale]

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@Mark: Acc. to Wikipedia article: Looks like you've got the flags mixed with the heraldry.

Maybe banners would be a better term than flags.

As far as flags, the article says that the flag on the papal side had a red cross on a white field, and this is consistent with the various banners found with some of the Agnus Dei representations.

The imperial flag apparently reversed this combination and used a white cross on a red background. Perhaps it is possible that a black eagle on gold would have been used as an imperial banner, but I'll have to actually see a blue banner with three gold fleur-de-lys and a red label before I accept that as a possibility.