Year 240 (CCXL) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sabinus and Venustus (or, less frequently, year 993 Ab urbe condita). The denomination 240 for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.
Events
By place
Roman Empire
The Roman Empire is threatened on several fronts at the same time. Africa revolts and tribes in northwest Germania, under the name of the Franks, are raiding the Rhine frontier.
Mani, a young mystic of Ctesiphon, proclaims himself a prophet at the court of Ardashir I. He preaches his doctrine, Manichaeism, throughout the Sassanid Empire.[2]
^Edwell, Peter (2007). Between Rome and Persia: The Middle Euphrates, Mesopotamia and Palmyra Under Roman Control. Routledge. p. 168. ISBN9781134095735.