fɹʌm fˈaɪvhˈʌndɹɪd sˈɪksti sˈɛvən tə fˈaɪvhˈʌndɹɪd sˈɛvənti θɹˈiː, ðə bˈɪzɐntˌiːn ˈɛmpaɪɚ wʌz ɪn ɐ wˈɔːɹ wɪððɪ ˈævɑːɹz, hˌuː ˈeɪmd tə kˈɑːŋkɚ bˈɪzɐntˌiːn pænˈoʊniə.
From 567 to 573, the Byzantine Empire was in a war with the Avars, who aimed to conquer Byzantine Pannonia.