Context: Herennius Etruscus ( Latin : Quintus Herennius Etruscus Messius Decius Augustus ; ca . 227 -- June 251 ) , was Roman emperor in 251 , in a joint rule with his father Decius . Emperor Hostilian was his younger brother . Herennius was born in or near Sirmium in Pannonia ( now Sremska Mitrovica , Serbia ) , during one of his father 's military postings . His mother was Herennia Cupressenia Etruscilla , a Roman lady of an important senatorial family . Herennius was very close to his father and accompanied him in 248 , as a military tribune , when Decius was appointed by Philip the Arab to deal with the revolt of Pacatianus in the Danube frontier . Decius was successful in defeating this usurper and felt confident to begin a rebellion of his own in the following year . Acclaimed emperor by his own troops , Decius marched into Italy and defeated Philip near modern Verona . In Rome , Herennius was declared heir to the throne and received the title of princeps iuventutis ( prince of youth ) . From the beginning of Herennius ' accession , Gothic tribes raided across the Danube frontier and the provinces of Moesia and Dacia . At the beginning of 251 , Decius elevated Herennius to the title of Augustus making him his co-emperor . Moreover , Herennius was chosen to be one of the year 's consuls . The father and son , now joint rulers , then embarked in an expedition against king Cniva of the Goths to punish the invaders for the raids . Hostilian remained in Rome and the empress Herennia Etruscilla was named regent . Cniva and his men were returning to their lands with the booty , when the Roman army encountered them . Showing a very sophisticated military tactic , Cniva divided his army in smaller , more manageable groups and started to push back the Romans into a marshy swamp . Sometime during the first two weeks of June , both armies engaged in 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 . With the news of the death of the emperors , the army proclaimed Trebonianus Gallus emperor , but in Rome they were succeeded by Hostilian , who would die shortly afterwards in an outbreak of plague ., Hostilian (230?  251) was Roman emperor in 251., Trajan (18 September 538August 117 AD) was Roman emperor from 98 to 117AD. Officially declared by the Senate "optimus princeps" ("the best ruler"), Trajan is remembered as a successful soldier-emperor who presided over the greatest military expansion in Roman history, leading the empire to attain its maximum territorial extent by the time of his death. He is also known for his philanthropic rule, overseeing extensive public building programs and implementing social welfare policies, which earned him his enduring reputation as the second of the Five Good Emperors who presided over an era of peace and prosperity in the Mediterranean world., The Roman emperor was the ruler of the Roman Empire during the imperial period (starting in 27 BC). The emperors used a variety of different titles throughout history. Often when a given Roman is described as becoming "emperor" in English, it reflects his taking of the title "Augustus" or "Caesar". Another title often used was "imperator", originally a military honorific. Early Emperors also used the title "princeps" (first citizen). Emperors frequently amassed republican titles, notably "Princeps Senatus", "Consul" and "Pontifex Maximus"., The Battle of Abritus, also known as the Battle of Forum Terebronii, occurred in the Roman province of Moesia Inferior (modern Razgrad, Bulgaria) probably in July, 251, between the Roman Empire and a federation of Scythian tribesmen under the Goth king Cniva. The Romans were soundly defeated, and Roman emperors Decius and his son Herennius Etruscus were both killed during battle. They became the first Roman emperors killed in a battle by a foreign enemy., Trajan Decius (c. 201June 251) was Roman Emperor from 249 to 251. In the last year of his reign, he co-ruled with his son Herennius Etruscus until they were both killed in the Battle of Abritus., Subject: herennius etruscus, Relation: place_of_death, Options: (A) battle (B) best (C) bulgaria (D) imperial (E) razgrad (F) roman
Output: razgrad