Eumenes I was
dynast (ruler) of the city of
Pergamon in
Asia Minor from 263 BC until his death in 241 BC. He was the son of Eumenes, the brother of
Philetaerus, the founder of the
Attalid dynasty, and Satyra, daughter of Poseidonius. As he had no children, Philetaerus adopted Eumenes to become his heir.