High Quality Content by WIKIPEDIA articles! Hostilian (Latin: Gaius Valens Hostilianus Messius Quintus Augustus; 230? – 251) was Roman emperor in 251. Hostilian was born in Sirmium (now Sremska Mitrovica, Serbia) in Illyricum sometime after 230, as the son of the future emperor Decius by his wife Herennia Cupressenia Etruscilla. He was the younger brother of emperor Herennius Etruscus.