"Quintus Herennius Etruscus Messius Decius (c. 227 – June 251) was Roman emperor in 251, ruling jointly with his father Decius. His father was proclaimed emperor ...
by his troops in September 249 while in Pannonia and Moesia, in opposition to Emperor Philip the Arab. Decius defeated Philip in battle, and was then proclaimed emperor by the Roman Senate. Herennius Etruscus was elevated to caesar in 250, then further raised to augustus in May 251. When the Goths, under Cniva, invaded the Danubian provinces, Herennius Etruscus was sent with a vanguard, followed by the main body of Roman troops, led by Decius. They ambushed Cniva at the Battle of Nicopolis ad Istrum in 250, routing him, before being ambushed and routed themselves at the Battle of Beroe. Herennius Etruscus was killed in the Battle of Abritus the following year, alongside his father. After the deaths of both emperors, Trebonianus Gallus, who had been governor of Moesia, was elected emperor by the remaining Roman forces." - (en.wikipedia.org 11.08.2021)
