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Yavana era

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Through Indian subcontinent, Indo-Greek Kingdom and East India

Harry Falk and others have suggested that the Yavana era actually started in 174 BCE, based on a reevaluation of the Azes era which is now thought to have started in 47/46 BCE. The exact historical event corresponding to the creation of this Yavana era is uncertain, but it may mark the alliance of Antimachos I and Apollodotus I in toppling Agathokles, thereby creating a unified realm north and south of the Hindu-Kush.

The creation of specific eras is a well-known phenomenon marking great dynastical events, such as the Seleucid era (starting in 312 BCE, with the return of Seleucus to Babylon), the Arsacid Era in Parthia (starting in 248/247 BCE), the Azes era in Gandhara (starting in 47/46 BCE), and the Kanishka era, when he established his empire in 127 CE.

It is now thought that the Kushan king Kanishka I created his own era precisely 300 years after the Yavana era, and probably in reference to it, so that year 1 of Kanishka (127 CE) would correspond exactly to year 301 of the Yavana era. Arguably, Kanishka wished to link his own rule to the rule of the Indo-Greeks, who for the first time had united the areas of Bactria and parts of ancient India.

The Yavana era progressively fell into disuse after the creation of the Kanishka era, the Kanishka era being used exclusively in inscriptions on relic caskets from the 18th year of his reign, from 145 CE. On statues of the Buddha, an inscription using the Yavana era is known from Gandhara as late as 209 CE (year 384 of the Yavana era), with the "Hashtnagar Buddha".

Coins of Plato

Although Greco-Bactrian or Indo-Greek kings generally did not put dates on their coins, some of them Plato (circa 140 BCE) and Heliocles uncharacteristically do so. Some of the coins of Plato have inscriptions such as MZ, MT, MN which can be interpreted as dates in the Greek numerals system using the Yavana era which started around 186 BCE. In that case Plato ruled around 140 BCE. This matches the dating given by numismatician Bopearachchi, who places Plato between 145–140 BCE, since his coins are not found in the ruins of Ai Khanoum, a Bactrian city which was destroyed during the reign of Eucratides.

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