It was probably Constantine in 312 who transformed the "agens vices prefectorum praetorio" of Rome, which had been the commander of the troops stationed in the City when the Praetorian Prefect was absent since the Severan period, into the civil vicar of Italia Suburbicaria, as part of his demilitarisation of the city after his victory over Maxentius. Thus, under Constantine, the diocese of Italia was split into the two vicariates of Italia Suburbicaria in the south and Italia Annonaria in the north, under the administration of the "vicarius urbis Romae" and the "vicarius Italiae" respectively. Italia Suburbicaria and Italia Annonaria were not "de jure" dioceses, but vicariates within a single Italian diocese, as the "Laterculus Veronensis" and the "Notitia Dignitatum" show. Constantine I also divided the diocese of Moesia into the dioceses of Dacia and Macedonia in 327.