Julia Mamaea and her mother Maesa played an instrumental role in the imperial accession of Alexander, then 13 years old, by securing the Praetorians' loyalty to him. They remained influential figures during his reign. Julia Mamaea attained the title
Augusta immediately following his acquisition of the throne. When Maesa died in 224, Mamaea took over the state affairs alongside an advisory board. The two women had collaborated in choosing 16 distinguished senators to form this advisory board and relied heavily on the lawyer
Ulpian, who was also from Syria. This created a court environment in which the advisory board ran the Roman Empire with Alexander as the mere figurehead. The new regime garnered the approval of surviving historical sources for overturning Elagabalus' measures and reinstating a more traditional form of government.
Ulpian, who held influence during Alexander's early reign, was made head of the
Praetorian Guard. However, he was unable to control the Praetorians, who eventually rebelled. Despite the swift flight to the palace under the protection of Julia Mamaea and Severus Alexander, Ulpian was murdered around 223 or 228. Upon reaching adulthood, Alexander confirmed his esteem for his mother and listened to her advice. She accompanied her son in his campaigns, and like her aunt Julia Domna, she too held many titles in addition to
Augusta:
mater augusti nostri et castrorum et senatus et patriae ("mother of the emperor, the camp, the senate and the country") and
mater universi generis humani ("mother of all the humanity"). The historian
Herodian and text
Historia Augusta characterize Alexander as a mama's boy who never managed to escape her maternal domination but that he resented her love of money. Mamaea's influence over him led some sources to call him Alexander Mamaeae. Though she was credited with her son's principled upbringing and the stability during his early reign, the army and ancient historians attributed Alexander's military shortcomings to Mamaea. By preventing his exposure to battles as a protective measure, Mamaea may have contributed to her son's deteriorating relationship with the army. According to
Herodian, Mamaea had become jealous of her daughter-in-law,
Sallustia Orbiana, whom Alexander married in 225, and whose father
Seius Sallustius had been possibly made
caesar, because she disapproved that there was another
Augusta. In epigraphical dedications, Mamaea was systematically given precedence over Orbiana. Herodian writes Julia Mamaea had Orbiana expelled from the palace and had her father executed, against the will of Alexander Severus, because his mother had too much influence over him and he obeyed all her orders. However, the same historian conflictingly credits Mamaea for selecting Orbiana as an
Augusta. The downfall of Orbiana's father, a result of his hostile relation with Mamaea, and the murder of Ulpian are two episodes which demonstrate the prevalence of political intrigues in Alexander's early reign. Mamaea called on
Origen, the Alexandrian Christian leader, to provide her with instructions in Christian doctrine. == Death ==