Hostilian - Augustus of Imperium Romanum from 251 to 251
Gaius Valens Hostilianus Messius Quintus Augustus was Roman emperor in 251.

He was born in Sirmium sometime after 230, as the son of the future emperor Decius by his wife Herennia Etruscilla. He was the younger brother of emperor Herennius Etruscus.

Following his father's accession to the throne, Hostilian received the treatment of an imperial prince, but was always kept in the shade of his brother Herennius, who enjoyed the privileges of being older and heir. In the beginning of 251, Decius elevated his son Herennius to co-emperor and Hostilian succeeded him in the title of princeps iuventutis (prince of youth).

Following the death of his father and brother, he was adopted by Trebonianus Gallus and made co-emperor, but died soon after from the plague.
Hostilian
Emperor Hostilian of the Roman Empire

(1) Hostilian 250-251 AD
Obverse: draped and cuirassed bust right from behind; C VAI HOST M QVIHTVS CAE
Reverse: Moesia facing head left, bull right, lion left; P M S C_OL VIM AN XII
Ref: Pick-Martin Ref.:4
(2) Hostilian AD 251
Obverse: C VALENS HOSTIL MES QVINTVS N C, radiate and draped bust right
Reverse: MARTI PROPVGNATORI, Mars advancing right, carrying spear and shield
Ref: RIC 177b; RSC 15; Sear 9556