Nice Thread (and map)! I really like that one can see how this developed. Have some Rep.!

I was wondering: If these are different kingdoms...why do all the heraldries have the same colors? I think this very unlikely (well at least it was in our reality). Colors signify things...and heraldry also serves to be able to destinguish houses/kingdoms/what-have-you from each other...for example also on a battle field. So you might want to mix it up a bit.
But maybe you have a perfectly reasonable explanation for it...in which case you can ignore this paragraph