Eumenes I and Adoption
Eumenes was the nephew and adopted son of Philetairos, first Attalid ruler of Pergamum (now in western Turkey). Eumenes succeeded to the throne when Philetairos died and obtained Pergamum's full independence from the Selucids, also declaring himself king.
Microsoft Encarta 98 Encyclopedia, 1993-97 Oxford Classical Dictionary, edited by M. Cary, et al. (Oxford: Oxford University Press, 1949) Mous, Vincent, and Schwarz, Andy. "Classical Period Rulers." Available at: www.dragonfire.net/~Cyberia/claruler.htm