Mezue ahịrịokwu na-esonụ: Dabere na akụkọ ihe mere eme nke John Skylitzes, okike nke isiokwu Dryinopolis, yana Koloneia dị nso, na idozi ndị mkpọrọ Byzantine nke ndị agha Bulgaria ebe ahụ bụ iji mee ka ọnọdụ Byzantine sie ike na Epirus megide mwakpo ndị iro n'ọdịnihu site na etiti na ọdịda anyanwụ Macedonia. Ihe iyi egwu Bulgarian lara n'iyi nwa oge mgbe
mgbakwunye nke Alaeze Ukwu Bulgaria nke Mbụ.