262 BCE: Eumenes rebels and wins against the Seleucid Antiochos I. Beginning of the Pergamon Empire.
237 BCE - 241 BCE: Attalos I of Pergamon defeats the Galatians at the headwaters of the Caioc River.
218 BCE: The Aegosages Celts enter Anatolia under Attalos of Pergamon.
189 BCE: The treaty of Apameea Kibotos. Peace and alliance is established between the Seleucid Kingdom and Rome joined by her allies, such as Pergamon and Rhodes. The Seleucids have to evacuate all the land and the cities from Asia Minor and to pay a huge war indemnity.
188 BCE: Maximum extent of the Pergamon Empire after Apamea peace.
133 BCE: Attalus III, the last king of Pergamon, bequeathes the whole of Pergamon to Rome.