|Millennium:||1st millennium BC|
|125 BC by topic|
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Year 125 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Hypsaeus and Flaccus (or, less frequently, year 629 Ab urbe condita). The denomination 125 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.
- Cleopatra Thea succeeds to the rule of the Seleucid Empire on the death of Seleucus V. She appoints Antiochus VIII Grypus as co-ruler.
- In Rome, Marcus Fulvius Flaccus proposes the extension of Roman citizenship to the northern Italians, but the Senate reacts by sending him off to deal with disturbances around Massilia. And in so doing commenced the conquest of Transalpine Gaul.
- Salisbury, Joyce (2001). Encyclopedia of Women in the Ancient World. ABC-CLIO. p. 56.