 In 193, when Septimius Severus seized power, he was the "Legatus legionis" of Legio I Italica on the lower Danube and was involved in the campaign against Pescennius Niger.Then sometime between 193 and 196 he was the "dux exercitus" of Moesia and Byzantium.In 197, Marius Maximus was the "dux exercitus" of Moesia and Lugdunum.