In 27 BC, the first settlement between Octavian and the Roman Senate formalised Octavian's absolute rule, bestowing the title of Augustus on him and making him the first Roman emperor. It also made arrangements about the provinces of the empire. Most provinces remained senatorial provinces, whose governors were chosen by the Senate from among the senators, while the frontier provinces became imperial provinces, whose governors were appointed by Augustus. The province of Illyricum was constituted out of both Dalmatia and the newly conquered southern Pannonia, and, despite being a frontier province, was designated as a senatorial province.