(Εὐμένης) I., king, or rather ruler, of PERGAMUS. He was the son of Eumenes, brother of Philetaerus, and succeeded his uncle in the government of Pergamus (B. C. 263), over which he reigned for two-and-twenty years. Soon after his accession lie obtained a victory near Sardis over Antiochus Soter, and was thus enabled to establish his dominion over the provinces in the neighbourhood of his capital; but no further particulars of his reign are recorded. (Strab. xiii. p.624; Clinton, F. H. iii. p. 40(1.) According to Athenaeus (x. p. 445d.), his death was occasioned by a fit of drunkenness. He was succeeded by his cousin Attalus, also a nephew of Philetaerus. It appears to be to this Eumenes (though styled by mistake king of Bithynia) that Justin (27.3) ascribes, without doubt erroneously, the great victory over the Gauls, which was in fact gained by his successor Attalus. [ATTALUS I., vol. i. p. 410a.]