genius populi Romani. Severus' reign represents a watershed in relations between Senate, emperors, and the military. Senatorial consent defined divine imperium as a republican permission for the benefit of the Roman people, and apotheosis was a statement of senatorial powers. Where Vespasian had secured his position with appeals to the genius of the Senate and Augustan tradition, Severus overrode the customary preferment of senators to senior military office. He increased plebeian privilege in Rome, stationed a loyal garrison there and selected his own commanders. He paid personal attention to the provinces, as sources of revenue, military manpower and unrest. Following his defeat of his rival Clodius Albinus at Lugdunum, he re-founded and reformed its imperial cult centre: dea Roma was removed from the altar and confined to the temple along with the deified Augusti. Fishwick interprets the obligatory new rites as those due any pater familias from his inferiors. Severus' own patron deities, Melqart/Hercules and Liber/Bacchus, took pride of place with himself and his two sons at the Secular Games of 204 AD. Severus died of natural causes in 211 AD at Eboracum (modern York) while on campaign in Britannia, after leaving the Empire equally to Caracalla and his older brother Geta, along with advice to "be harmonious, enrich the soldiers, and scorn all other men." By 212 AD, Caracalla had murdered Geta, pronounced his damnatio memoriae and issued the Constitutio Antoniniana: this gave full Roman citizenship to all free inhabitants of the Empire. and was couched as a generous invitation to celebrate the "victory of the Roman people" in foiling Geta's "conspiracy". In reality, Caracalla was faced by an endemic shortfall of cash and recruits. His "gift" was a far from popular move, as most of its recipients were humiliores of peasant status and occupation – approximately 90% of the total population. Humiliores they remained, but now liable to pay taxes, serve in the legions and adopt the name of their "liberator". Where other emperors had employed the mos maiorum of family obligation at the largely symbolic level of genius cult, Caracalla literally identified his personal survival with the state and "his" citizens. Caracalla inherited the devotion of his father's soldiery but his new citizens were not inclined to celebrate and his attempts to court popularity in Commodan style seem to have misfired. In Philostratus' estimation, his embrace of Empire foundered on his grudging, parochial mindset. He was assassinated