By what names would the factions have been known?

[Shahed]

Those skins will probably go into the Broken Crescent mod (image heavy link!) I posted the map above from that mod.

It has a lot of the factions that existed during this period.

However that guy who is currently doing Byzantium skins only, is redoing all the factions one at a time. So he will release the skins independently as well. I'm going to install those for sure, whichever way they come. Check the screens in that link, you might like em as well.

Spoiler Alert, click show to read: 

Like all good warriors Kataphraktoi need competition.
Meet the Abbasid Faris.


Note the saddle detail on these Arabian mares.