|Millennium:||1st millennium BC|
|139 BC by topic|
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Year 139 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Piso and Laenas (or, less frequently, year 615 Ab urbe condita). The denomination 139 BC 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.
- The Lusitanian War ends when the rebellion collapses after the assassination of Viriathus by a Roman agent.
- Viriathus, Lusitanian leader (assassinated)