Magister militum
The highest rank of Magister militum praesentalis (lit. "Master of Soldiers in the Presence [of the Emperor]") was accorded to the commanders of imperial escort armies (typically 20-30,000 strong). The title was equivalent in rank to "Magister utriusque militiae" ("Master of Both Services"), "Magister equitum" ("Master of Cavalry") and "Magister peditum" ("Master of Infantry").