This is How Two Roman Emperors Brutally Died During the Same Battle in 251 AD

On July 1, 251, Decide and his son Herennius Etruscus, joint Roman Emperors, died fighting in the Battle of Abritus. An excerpt from the article:

"The Battle of Abritus in 251 AD is seldom seen as anything more than a footnote in the history of the Roman Empire. The fact that it occurred in the midst of the chaotic Third Century Crisis also means its importance is overlooked. However, it was a noteworthy encounter because it was the only battle to claim the lives of two Roman emperors. Decius and his son, Herennius Etruscus, both died and were also the first Roman emperors to be killed by a foreign enemy.

Although the Third Century Crisis had already occurred upon the death of Alexander Severus in 235, the death of two rulers on the same day only increased the level of instability within the empire. The annihilation at Abritus, and the subsequent acquiescence to Gothic demands placed the empire under serious strain. Matters were made worse by the Plague of Cyprian which lasted over a decade and at its peak, claimed 5,000 lives a day. By 270, the empire was on the verge of collapse and was only saved by the military brilliance of Emperor Aurelian."