Eucratides I, also known as Eucratides the Great, was one of the most important Graeco-Bactrian kings. Eucratides overthrew the Euthydemid dynasty of Bactria and restored the Diodotid dynasty of Diodotus I, allied to the Parthian Empire. Eucratides fought against the easternmost Hellenistic and Indian rulers in India, holding territory in the Indus and as far as Barigaza until he was finally defeated by Menander and pushed back to Bactria. Eucratides minted a vast and prestigious coinage, suggesting a rule of considerable importance and prosperity. His son, Heliocles I was father of Heliocles II, who was the last Greek king to rule in Bactria, as Yuezhi and Saka nomads overran the country c.100 BCE.