Mezue ahịrịokwu na-esonụ: Na mbido narị afọ nke 11, mpaghara nke mechara bụrụ Theme nke Sirmium dị n'ime ókèala nke Alaeze Ukwu Bulgarian nke Mbụ, n'okpuru Tsar Samuil na onye isi obodo (voivode) a maara dị ka Sermon chịrị Sirmium na mpaghara gbara ya gburugburu. N'agha were ogologo oge, eze ukwu Byzantium bụ́ Basil nke Abụọ
meriri Bulgaria, ma guzobe isiokwu ndị Byzantine ọhụrụ na ndị ọchịchị obodo ndị ọzọ n'okpuru ndị ọchịagha ("strategoi") na ókèala ya. Akụkụ etiti nke alaeze Samuil ghọrọ Okwu nke Bulgaria, akụkụ ebe ugwu ọwụwa anyanwụ ghọrọ Okwu nke Paristrion, akụkụ ebe ugwu ọdịda anyanwụ ghọrọ Okwu nke Sirmium.