The Attalid dynasty was started by Philetairos, who was appointed by Lysimachos but declared independence during the Agathokles scandal.
Since he was a eunoch, he adopted Eumenes I and made him his successor.
Philetairos deserts Lysimachos and offers Pergamon to Seleukos I Nikator. This begins the Kingdom of Pergamon.
Eumenes I becomes ruler of the Kingdom of Pergamon after the death of Philetairos.
Antiochos I Soter is defeated while attempting to retake Pergamon by the Attalid Eumenes I in a battle near Sardis.
Attalos attacks the forces of the usurper Adaios and defeats him, then engages in friendly negotiations with Lampsakos, Alexandria Troas, and Ilion, all of which had remained loyal to him.
Assos comes under the control of the Attalid Kingdom.
Akanthos attacked by a fleet of Romans and the Pergamene Kingdom in the Second Macedonian War.
Death of Attalos I of Pergamon. Eumenes II becomes king.
Antiochos III is defeated by Scipio Asiaticus at the Battle of Magnesia. Through treaty, Ephesos comes under the Attalids. Alabanda comes under Roman control.
Samos is given by the Romans to the Attalids.
Treaty of Apamea. Euromos, Laodikeia ad Lykon, Sestos, and Abydos returned to the Kingdom of Pergamon.
Pessinos is made a sanctuary by the Attalid kings.
Armies of Eumenes II and the Romans sack Abdera.
Attalos II ascends the throne of Pergamon.
Attalaia is founded by Attalos II.
Death of Attalos II of Pergamon. Attalos III ascends the throne.
Adramytteion, Smyrna, Sestos, Synnada, Laodikeia ad Lykon, Attalaia, Erythrai, Ephesos, Perge, and Assos come under Roman control after Attalos III, the last Attalid king, leaves it to Rome in his will.