The Cambridge History of India, Vol. I: Ancient India v1.c30.s3.11

v1.c30.s3.11

Although the evidence for the very existence of Heliocles is purely numismatic, it is almost certain that he was the son of Eucratides, and quite certain that he succeeded Eucratides both in Bactria and in India. That he was the last Yavana king to rule in Bactria is shown by the fact that after his reign coins of Greek workmanship cease entirely in that region, and are replaced by the rude imitations of his coins which supplied the currency of the barbarous Çaka conquerors. That he extended the conquests of Eucratides in India is shown by his restrikings of coins originally issued by rulers belonging to the house of Euthydemus (p. 553).