Valerian (253–60) identified Christianity as the largest, most stubbornly self-interested of non-Roman cults, outlawed Christian assembly and urged Christians to sacrifice to Rome's traditional gods. His son and co-Augustus Gallienus, an initiate of the Eleusinian Mysteries, identified himself with traditional Roman gods and the virtue of military loyalty. Aurelian (270–75) appealed for harmony among his soldiers ("concordia militum"), stabilised the Empire and its borders and established an official, Hellenic form of unitary cult to the Palmyrene "Sol Invictus" in Rome's Campus Martius. The senate hailed him as "restitutor orbis" (restorer of the world) and "deus et dominus natus" (god and born ruler); he was murdered by his Praetorians. His immediate successors consolidated his achievements: coinage of Probus (276–82) shows him in radiate solar crown, and his prolific variety of coin types include issues showing the temple of Venus and "Dea Roma" in Rome.