180s BC

• Cato the Elder criticizes the consul Marcus Fulvius Nobilior for giving awards to Roman soldiers for doing ordinary tasks, such as digging wells.

• The defeat of Antiochus III by the Romans in the Battle of Magnesia robs the Aetolian League of its principal foreign ally and makes it impossible for them to stand alone in continued opposition to Rome. The League is forced to sign a peace treaty with Rome that makes it a subject ally of the Republic. Although the League continues to exist in name, the power of the League is broken by the treaty and it never again constitutes a significant political or military force.

• The Romans under consul Gnaeus Manlius Vulso, along with a Pergamene army under Eumenes II, defeat the Galatians in Anatolia and make them subjects of Pergamum.
• The city of Philadelphia (now Alaşehir, Turkey) is founded by King Eumenes II of Pergamon. Eumenes names the city after his brother, Attalus, whose loyalty earns him the nickname, "Philadelphus", literally meaning "one who loves his brother".

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