Year 159 (CLIX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time in Roman territories, it was known as the Year of the Consulship of Quintillus and Priscus (or, less frequently, year 912 Ab urbe condita). The denomination 159 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.