aside from the german writing there's nothing really german about haven, so its not really supremacy... especially when the king's name is Nikolai O_o
As for academy, imo just like haven is a stereotypical medieval kingdom, so the academy is an east-based faction. There is a lot of Hindi influence in their units (jewellry, turbans, elephant riding hero etc.) apart from arabic (in fact it's rather north african as in morroco, rather than arabic from the peninsula).
Basically what i'm trying to say is I can't see any cultural supremacy in the factions
btw. cool units, but the priest's hood looks a bit stupid.. i don't really like the royal griffin either, but the rest of the units are great!