ɪt wʌz ɚɹˈɪdʒɪnəli pˈɑːɹt ʌvðə pɹiːtˈoːɹiən pɹˈiːfɛktʃɚɹ ʌv ˈɪɾəli ænd wʌz ɪŋkˈoːɹpɚɹˌeɪɾᵻd baɪ ðə pɹiːtˈoːɹiən pɹˈiːfɛktʃɚɹ ʌv ɪlˈɪɹɪkəm wɛn ɪt wʌz ɪstˈæblɪʃt ɪn θɹˈiːhˈʌndɹɪd fˈoːɹɾi sˈɛvən.
It was originally part of the praetorian prefecture of Italy and was incorporated by the praetorian prefecture of Illyricum when it was established in 347.