Domitian, Roman emperor (died 96)

AD 51 (LI) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Scipio. The denomination AD 51 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Domitian was Roman emperor from 81 to 96. The son of Vespasian and the younger brother of Titus, his two predecessors on the throne, he was the last member of the Flavian dynasty. Described as "a ruthless but efficient autocrat", his authoritarian style of ruling put him at sharp odds with the Senate, whose powers he drastically curtailed.

October 24 is the 297th day of the year in the Gregorian calendar; 68 days remain until the end of the year.