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Eumenes II

King of Pergamon from 197 to 159 BC

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War against the Seleucids and expansion of the Attalid kingdom

The eldest of four sons to king Attalus I and queen Apollonis, Eumenes was presumably born prior to 220 BC. Eumenes followed in his father's footsteps upon becoming king and collaborated with the Romans to oppose Antigonid and especially Seleucid expansion in Asia Minor towards the Aegean. Eumenes, like his father, aided the Romans whenever he could. Following the end of the Second Macedonian War, he assisted Rome and the Achaean League against the Spartan tyrant Nabis in the Laconian war.

In the Roman-Seleucid War, he informed the Romans for Antiochus' ambitions by sending his brother, Attalus II, ahead and then sided with the Romans. He had refused to marry a daughter of Antiochus III upon noticing that he was about to engage in a war against the Romans. He then had married Stratonice of Pergamon, daughter of Ariarathes IV (King of Cappadocia) and his wife Antiochis, and their son was named Attalus III.

He played a crucial role in the defeat of Antiochus the Great at the Battle of Magnesia in 190 BC, where he commanded the right flank as well as in the naval battles against the Seleucids.

Following the Peace of Apamea in 188 BC, he received the regions of Phrygia, Lydia, Pisidia, Pamphylia, and parts of Lycia and Thracian Chersonese from his Roman allies. Nonetheless, by dividing Asia Minor between their allies, Rhodes and Pergamon, the Romans made sure that neither state would be able to become too powerful in the region.

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