Roma (193) — the same event in Cassius Dio, Herodian, History of the Empire and Historia Augusta

Cassius Dio: An auction of the empire before the praetorian camp: Julianus offered 25,000 sesterces per man, outbid Sulpicianus and was accepted as…

What each source says

Cassius Dio, Roman History · AD 193 · Roma

An auction of the empire before the praetorian camp: Julianus offered 25,000 sesterces per man, outbid Sulpicianus and was accepted as emperor

just as if it had been in some market or auction-room, both the City and its entire empire were auctioned off.
Location: 74(73).11

Herodian, History of the Empire · AD 193 · Rome

From the camp wall the guards shout that they will sell the empire to the highest bidder. Julianus climbs up and wins it by promising each soldier a large sum.

but fent out fome of the ftrongeft Lungs and loudeft Voices up- the Wor y Emp be fet to Sale, and confign’d to the higheft Bidder-, and that they would conduft…
Location: 2.6

Historia Augusta · AD 193 · Rome

After Pertinax's death, Julianus finds the Senate closed, is brought by two tribunes to the praetorian camp, and contends with Sulpicianus for the throne

Publium Florianum et Vectium Aprum, coeperunt cohortari tribuni, ut locum arriperet. quibus cum diceret iam alium imperatorem appellatum, retinentes eum ad…
Location: Did. 2.4, 2.5, 2.6

Place: Rome

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