Prefects' Board runs a committee system directed under the Head Prefect. Properly it was a role that belonged to the praetorian prefect. Severus's maternal cousin was the praetorian prefect and consul Gaius Fulvius Plautianus. In Constantinople he obtained the patronage of the powerful praetorian prefect Aurelianus. One was the very acceptable Claudius Mamertinus, previously the Praetorian prefect of Illyricum. It was dedicated to a friend, the Praetorian prefect Gaius Septicius Clarus. Caligula spent time befriending the Praetorian prefect, Naevius Sutorius Macro, an important ally. In 288, Maximian appointed Constantius to serve as his praetorian prefect in Gaul. Starting from Vespasian, whose son, Titus was himself a Praetorian prefect, they were ranked first. Allectus was killed on the North Downs in battle with Constantius' praetorian prefect, Asclepiodotus. A marquess's Chancellor was ranked as the equivalent of a county Prefect. He was educated at Hogwarts, where he was a prefect in Slytherin House. It possessed a proconsul, rather than an urban prefect. He was executed on the orders of Pontius Pilate, the Roman prefect of Judaea. He achieved the rank of provincial governor and urban prefect.