In 586 and 587, Comentiolus won several victories against the Slavs on the Lower Danube and nearly caught the Avar Khagan Bayan twice.
Pada tahun 586 dan 587, Komentiolos memenangkan beberapa kemenangan melawan Slavia di Donau Hilir dan hampir menangkap Avar Khagan Bayan dua kali.