Eumenes I and Adoption

Coin struck during the reign of Eumenes I, depicting the head of Eumenes' uncle Philetaerus on the obverse and seated Athena, patron deity of the city of Pergamon, on the reverse.
Source: Wikipedia.org.

Biography

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.

References

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