Mezue ahịrịokwu na-esonụ: Na narị afọ nke 11, Alaeze Ukwu Bulgaria nke Mbụ dara n'okpuru mwakpo nke Rus na Byzantine, wee bụrụ akụkụ nke Alaeze Ukwu Byzantine ruo 1185. Mgbe ahụ, a
nnukwu nnupụisi nke ụmụnne abụọ, Asen na Peter nke usoro ndị Asen, weghachiri steeti Bulgaria iji guzobe Alaeze Ukwu Bulgaria nke Abụọ. Mgbe ọ ruru ogo ya na 1230s, Bulgaria bidoro ịda n'ihi ọtụtụ ihe, ọkachasị ọnọdụ ala ya nke mere ka ọ bụrụ nke nwere ike ịwakpo ọgụ na mwakpo sitere n'ọtụtụ akụkụ. Nnupụisi nke ndị ọrụ ugbo, otu n'ime mmadụ ole na ole nwere ihe ịga nke ọma n'akụkọ ihe mere eme, mere ka Ivaylo, bụ́ onye na-azụ ézì, bụrụ eze ukwu. Ọchịchị ya dị mkpirikpi bụ ihe dị mkpa iji nwetaghachi - ọbụlagodi na ọkara - iguzosi ike n'ezi ihe nke steeti Bulgaria. Oge na-aga nke ọma na-esote mgbe 1300 gasịrị, mana kwụsịrị na 1371, mgbe nkewa nkewa mere ka Bulgaria kewaa n'ime obere Tsardoms atọ. Ka ọ na-erule afọ 1396, Alaeze Ukwu Ottoman meriri ha. Ndị Turkey kpochapụrụ usoro ndị isi na ndị ụkọchukwu na-achị achị nke Bulgaria, Bulgaria nọgidekwara bụrụ akụkụ dị mkpa nke Alaeze Ukwu Ottoman ruo afọ 500 sochirinụ.