authority of the Praetorian prefects sometime in the early 3rd century. Organization In the beginning, the corps had difficulty recruiting men. In an effort to entice men to enlist the Lex Visellia was passed in 24 AD, granting full citizenship and a bonus cash stipend to Vigiles after six years of service. By the 2nd century, citizens were also allowed to enlist. The Vigiles were accommodated in barracks and patrolled the streets, especially at night, on the lookout for any unsupervised fires. Every householder was obliged to keep equipment for fighting fires, and the men themselves were equipped with pumps, buckets, hooks (for pulling down burning material), picks, mattocks and axes. They also used ballistae for knocking down burning houses and creating firebreaks. They even had their own medical support (medici), with four doctors attached to each cohort, and their own chaplains (victimarii). A siphonarius operated a pump and an aquarius supervised the supply of water. The ordinary firefighters were called milites (soldiers). The Vigiles were organized into seven cohorts each 1,000 men strong. The cohorts contained seven centuries. The centuries were commanded by centurions, and the cohort was commanded by a tribune. The commander of the Vigiles was the Praefectus Vigilum. The centurions of the Vigiles would often go on to become centurions in the Urban Cohorts, followed by becoming a centurion in the Praetorian Guard. They would then transfer to the Legions, where they could reach the rank of Primus Pilus. The prefect was also known as the Prefect of the Watch. The prefect was an eques appointed by the emperor to command the seven cohorts. It was not a particularly sought after office until the 3rd century. Prominent jurists with a legal background began serving as Prefect to fulfil the magisterial capacity of the office. As a judge, the Prefect made rulings in his court for the common thieves caught during the night. Eventually, the Prefect was given jurisdiction over daytime petty crimes as well. According to Justinian, in the event of more serious crimes the decision was made by the praefectus urbi, "if the offender is a person of such thuggish and infamous character ... the case is sent on to the prefect of the city". Often times Praefectus Vigilum would go on to be prefects of the Praetorian Guard. Beyond the office of the prefect, the Vigiles were ordered by rank similar to the military.