A deceased emperor held worthy of the honor could be voted a state divinity ("divus", plural "divi") by the Senate and elevated as such in an act of apotheosis. The granting of apotheosis served religious, political and moral judgment on Imperial rulers and allowed living Emperors to associate themselves with a well-regarded lineage of Imperial "divi" from which unpopular or unworthy predecessors were excluded. This proved a useful instrument to Vespasian in his establishment of the Flavian Imperial Dynasty following the death of Nero and civil war, and to Septimius in his consolidation of the Severan dynasty after the assassination of Commodus.