During the reign of Emperor Justinian I, with increasing military threats and the expansion of the Eastern Empire, three new posts were created: the "magister militum per Armeniam" in the Armenian provinces, formerly part of the jurisdiction of the "magister militum per Orientem", the "magister militum per Africam" in the reconquered African provinces (534), with a subordinate "magister peditum", and the "magister militum Spaniae" (ca.
Na Vzhodu sta bila na položaju "magister militum praesentalis" dva generala.