Note 1955 — Chapter X · THE PRINCIPATE (continued 2)
Reading edition
Vita Commodi 14 “praefectos urbi eadem facilitate mutavit”; Vita Pii 8 “successorem viventi bono judici nulli dedit nisi Orfito praefecto urbi, sed petenti.” For the frequent life-long tenure of the office see Dio Cass. lii. 24.