Magister militum

Magister militum (Latin for "master of soldiers", plural magistri militum) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great.[dubious ] The term referred to the senior military officer (equivalent to a war theatre commander, the emperor remaining the supreme commander) of the empire. In Greek sources, the term is translated either as strategos or as stratelates.

The original command structure of the Late Roman army, with a separate magister equitum and a magister peditum in place of the later overall magister militum in the command structure of the army of the Western Roman Empire.
The high command structure of the West Roman army c. 410–425, based on the Notitia Dignitatum.