Wings in crests may be used in various examples (heraldic achievements) even when there are no wings in the insignia and in examples where there are eagles in the insignia, but only wings in the crest. There are more of these examples, so they're easier to find. The artistic techniques can be visualized. Frequently there are a fair number of feathers that are standing up vertically in the wings.
Finding an actual vol of conjoined wings as a heraldic charge before 1500 is pretty uncommon.
Finding an actual vol of conjoined wings as a heraldic charge before 1500 is pretty uncommon.