Mezue ahịrịokwu na-esonụ:
nnupụisi nke ndị Byzantium na 1185 na karịsịa mgbe mmeri na Tryavna ndị Bulgaria ji obi ike were ụzọ agha ahụ. N'ihi mbọ ha, ndị Bulgaria malitere ijide mpaghara Thrace na Masedonia site n'aka ndị Byzantine; ndị agha Bulgaria jiri ebe ha siri ike na ugwu ugwu Balkan na osimiri Danube dị ka ntọala maka agha ahụ.