EUMENES I. a king of Pergamus, succeeded his uncle Philoterus 263 B. C., and having engaged in hostilities with Antiochus, king of Syria, defeated him near Sardes. But he fell a victim to his habits of drunkenness 241 B. C. and was succeeded by his cousin Attalus. (Strabo, xii. 624; Athenæus, x. p. 445.)