Demetrius I of Bactria

Demetrius I Anicetus (Ancient Greek: Δημήτριος Ἀνίκητος, romanized: Dēmḗtrios Aníkētos, "Demetrius the Unconquered"), also called Dimetriya or Dhammamita in Indian sources, was a Greco-Bactrian king and the founder of the Indo-Greek kingdom, who ruled areas from Bactria to ancient northwestern India.

He was the son of the Greco-Bactrian ruler Euthydemus I, an Ionian-Greek from one of the Magnesias in Ionia, though it is uncertain from which one (Magnesia on the Maeander or Magnesia ad Sipylum).

He succeeded him around 200 BC, after which he conquered extensive areas in what is now southern Afghanistan, Pakistan and northwestern India.

He was never defeated in battle and was posthumously referred to as "the Unconquered" (Ἀνίκητος, Aniketos) on the pedigree coins of his successor Agathocles of Bactria. Demetrius I may have been the initiator of the Yavana era, starting in 186–185 BC, which was used for several centuries thereafter.

Demetrius was the name of at least two and probably three Bactrian Greek kings. The much debated Demetrius II was a possible relative, whereas Demetrius III (c. 100 BC), is known only from numismatic evidence.

Source: Wikipedia — https://en.wikipedia.org/wiki/Demetrius_I_of_Bactria