The Emperor also had under his control a number of smaller, but potentially difficult provinces that did not need an entire legion. These provinces were put under the control of governors of equestrian status. New conquests generally fell into this equestrian category, but most were later changed in status to reflect the changing conditions of Rome's growing empire. Thus, on conquest a province would become a procuratorial province until it was decided that it should become either an imperial or senatorial province and thus governed by either a propraetor or proconsul. Like the other imperial provinces, the equestrian governors could serve any length of time up to 5 years, or even longer.