Born about 222 B.C., Demetrius I, son of Euthydemus, ruled from c.200 to 180 B.C. He was never defeated in battle, earning the epithet Aniketos (“Invincible”). About 180 B.C. he invaded India, conquering the Indus valley and advancing far into the Ganges plain. On his handsome bronze coinage, Demetrius placed the head of an elephant, with a kerykeion on the reverse-the symbolic staff carried by Greek heralds, and by the god Hermes.