==Sources=====Primary Sources===* Cassius Dio, "Roman History", Books 74 & 75* Herodian, "Roman History", Books 2 & 3* Historia Augusta, "Life of Pescennius Niger"===Secondary Sources===* Southern, Pat.
* سال پنج امپراتور* Cassius Dio, "Roman History", Books 74 & 75* Herodian, "Roman History", Books 2 & 3* Historia Augusta, "Life of Pescennius Niger"* Southern, Pat.