mgcoins database

Rome AD 250 AR antoninianus 4.09 g 2.2 cm 2.2 cm 6h

obverse: hd Trajanus Decius r radiate bust draped and cuirassed IMP C M Q TRAIANVS DECIVS AVG
reverse: Trajanus Decius on horseback l r hand raised, holding sceptre in l ADVENTVS AVG
RCV III 9366, RSC 4, RIC 11b
Schulman BV Amsterdam 11 Oct 1980 

Gaius Messius Quintus Decius c 195 (Sirmium, Sremska Mitrovica- Servia) 249-251
249 Proclamation as emperor by his troops after success against the Gothic invaders.
The emperor Philippus I and his son Philippus II defeated at Verona.
Philippus I killed in battle. Philippus II killed in battle or brought to Rome where he was put to deatrh by the praetorians.
251 Trajanus Decius and his son Herennius Etruscus killed in a disastrous battle against the Goths.
General Trebonianus Gallus proclaimed emperor by the remnants of the Roman army.

This coin was struck to the occasion of emperor's return (adventus) to Rome.
The adventus was a ceremony in ancient Rome, in which an emperor was formally welcomed into a city either during a progress or after a military campaign, often (but not always) Rome.