So, what if either the First Bulgarian Empire managed to capture Constantinople (say, under Tsar Simon), or the Second Bulgarian Empire was more able to capitalize on the Latin Empire's decline in the 13th century? In particular:
-Will most Greeks be content under Bulgarian rule?
-The Bulgarian Tsars will probably make Constantinople their capital and start calling themselves "Roman Emperor"-what are the chances that the Bulgarian court/government eventually adopts Greek as its first language and turns into another Byzantine dyansty?
-How much would Bulgarian culture influence Byzantine/Greek culture?
-Would Bulgaria/Byzantium be able to handle the Ottomans better than our Byzantium did?