map looks amazing.
still, i want to point out some inaccuracies:
moldova capital at that time was Baia, closer to the carpathian mountains
second was Siret, around 1350
and only after that, suceava
iassy was moldavian capital only in 1564
regardin silistra, as capital of bulgaria, this is really wrong. silistra was at best capital of dobrudja
http://en.wikipedia.org/wiki/Dobruja
maybe you'll add this region and bulgaria will have as capital Tarnovo.