Demetrius I (Greek: Δημήτριος Α΄; Persian: ‎‎/Pashto: دیمتریوس بلخی‎) was a Greek king (reigned c. 200–180 BC) of Gandhara. He was the son of Euthydemus and succeeded him around 200 BC, after which he conquered extensive areas in what now is now Afghanistan, Iran, and Pakistan. thus creating an Indo-Greek Kingdom far from Hellenistic Greece.