Assertion: empire's ruler | /r/CapableOf | take the title of magister militum
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Source sentences:
text: After 395, the emperors in the Western Roman Empire were usually figureheads, while the actual rulers were military strongmen who took the title of magister militum, patrician or both—Stilicho from 395 to 408, Constantius from about 411 to 421, Aëtius from 433 to 454 and Ricimer from about 457 to 472.