Herennius Etruscus - Augustus of Imperium Romanum from Early 251 to June 251
Quintus Herennius Etruscus Messius Decius Augustus was Roman emperor in 251, in a joint rule with his father Decius. Emperor Hostilian was his younger brother.

Herennius was made emperor in early 251, and accompanied his father on an expedition against king Cniva of the Goths, to punish him for several raids. Hostilian remained in Rome and the empress Herennia Etruscilla was named regent.

Sometime during the first two weeks of June, the armies met at the battle of Abrittus. Herennius died in battle, struck by an enemy arrow. Decius survived the initial confrontation, only to be slain with the rest of the army before the end of the day.

Herennius and Decius were the first two emperors to be killed by a foreign army in battle. Hostilian survived, but died soon after from the plague.
Herennius Etruscus
Emperor Herennius Etruscus of the Roman Empire

Obverse: radiate, draped bust right from behind; Q HER ETR MES DECIVS NOB C
Reverse: Spes standing left, holding flower and raising skirt; SPES PVBLICA
Ref: RIC IV 149, RSC IV 38, Hunter III 2...
(2) Herennius Etruscus 250-251 AD
Obverse: Q HER ETR MES DECIVS NOB C / Radiate, draped & cuirassed bust right
Reverse: PIETAS AVGG / Mercury standing left, holding purse & caduceus
Ref: Sear 9520