Year251 (CCLI) was acommon year starting on Wednesday of theJulian calendar. At the time, in the Roman Empire, it was known as theYear of the Consulship of Traianus and Etruscus (or, less frequently,year 1004Ab urbe condita). The denomination 251 for this year has been used since the early medieval period, when theAnno Dominicalendar era became the prevalent method in Europe for naming years.
InRome,Hostilian, son of Decius, succeeds his father, whileTrebonianus Gallus is proclaimedEmperor by the troops. Gallus accepts him as co-emperor, but an outbreak ofplague strikes the city, and kills Hostilian.
