Under the empire, the citizens were divided into three classes, and for members of each class, a distinct career path was available (known as the "cursus honorum"). The traditional magistracies were only available to citizens of the senatorial class. The magistracies that survived the fall of the republic were (by their order of rank per the "cursus honorum") the consulship, praetorship, plebeian tribunate, aedileship, quaestorship, and military tribunate. If an individual was not of the senatorial class, he could run for one of these offices if he was allowed to run by the emperor, or otherwise, he could be appointed to one of these offices by the emperor. During the transition from republic to empire, no office lost more power or prestige than the consulship, which was due, in part, to the fact that the substantive powers of republican Consuls were all transferred to the emperor. Imperial Consuls could preside over the senate, could act as judges in certain criminal trials, and had control over public games and shows. The Praetors also lost a great deal of power, and ultimately had little authority outside of the city. The chief Praetor in Rome, the urban praetor, outranked all other Praetors, and for a brief time, they were given power over the treasury. Under the empire, the plebeian tribunes remained sacrosanct, and, in theory at least, retained the power to summon, or to veto, the senate and the assemblies. Augustus divided the college of Quaestors into two divisions, and assigned one division the task of serving in the senatorial provinces, and the other the task of managing civil administration in Rome. Under Augustus, the Aediles lost control over the grain supply to a board of commissioners. It wasn't until after they lost the power to maintain order in the city, however, that they truly became powerless, and the office disappeared entirely during the 3rd century.