Kammala jumla mai zuwa: Sunan Ioannina ya bayyana a karo na farko a 879, a cikin ayyukan Majalisar Constantinople ta huɗu, wanda ke nufin wani Zacharias, Bishop na Ioannine, suffragan na Naupaktos. Bayan da
Nasarar Byzantine na Bulgaria, a cikin 1020 Emperor Basil II () ya ba da bishop na gida ga Archbishopric na Ohrid. A cikin yarjejeniyar rarraba ƙasashen Byzantine bayan Yaƙin Crusade na Hudu, an yi alkawarin Ioannina ga Venetians, amma a cikin taron, ya zama wani ɓangare na sabon masarautar Epirus, wanda Michael I Komnenos Doukas ya kafa.