"Demetrius I (Greek: Δημήτριος Α΄), also called Dharmamita, was a Greco-Bactrian/Indo-Greek (Yona in Pali language, "Yavana" in Sanskrit) king (reigned c. 200–180 BC), who ruled areas from Bactria to ancient northwestern India. He was the son of the Greco-Bactrian ruler Euthydemus I and succeeded him around 200 BC, after which he conquered extensive areas in what is now Afghanistan and Pakistan.
He was never defeated in battle and was posthumously qualified as the Invincible (Aniketos) on the pedigree coins of his successor Agathocles. Demetrius I may have been the initiator of the Yavana era, starting in 186–185 BC, which was used for several centuries thereafter." - (en.wikipedia.org 31.01.2020)
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