what kind of banners did the real units use?

[madmatg]

ive been toying with taking away the banners on my game for good looks, and this got me to thinking about the real banners, in real life the banners were different for each individual unit right? just wondering about banners

[L.C.Cinna]

Roman cavalry vexillum 3rd century CE:

[Boyar Son]

wow

that'll inspire me to war

[Megas Methuselah]

likewise...

[Centurion Crastinus]

I think it had to do alot with where the legion was recruited. To the best of my knowledge the legions during the late republic which were recruited in spain had bulls on their banners. The ones during the era of Augustis had capricorns on them. Although Legio V Alaude had larks on their banner which is in part to to their recruitment in southern Switzerland and their "barbarian" heritage. If this info is wrong, please correct me.