|Millennium:||1st millennium BC|
|126 BC by topic|
Year 126 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Lepidus and Orestes (or, less frequently, year 628 Ab urbe condita). The denomination 126 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.
- Tyre successfully revolts from the Seleucid Empire.
- Seleucus V Philometor succeeds his father Demetrius II as king of the Seleucid Empire. Due to his youth, his stepmother Cleopatra Thea acts as regent.