Mogontiacum (269) — the same event in Aurelius Victor and Eutropius

Aurelius Victor: In Laelianus's revolt, Postumus is killed for refusing the soldiers' demand to let them plunder the citizens of Mogontiacum…

What each source says

Aurelius Victor, De Caesaribus · AD 269 · Mogontiacum

In Laelianus's revolt, Postumus is killed for refusing the soldiers' demand to let them plunder the citizens of Mogontiacum.

quo non minus feliciter fuso suorum tumultu periit, quod flagitantibus Mogontiacorum direptiones, quia Laelianum iuverant, abnuisset.
Location: Aur. Vict. Caes. 33.8

Eutropius, Breviarium · AD 269 · Mogontiacum

Postumus is killed by his soldiers after refusing to let them plunder the rebellious city of Mogontiacum.

Qui seditione militum interfectus est, quod Mogontiacum civitatem, quae adversus eum rebellaverat Laeliano res novas moliente, diripiendam militibus tradere…
Location: Eutr. 9.9

Place: Mogontiacum

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