Pantaleon (reigned c. 190 BC- 185 BCE) was a son of the Greco-Bactrian king Demetrius and one of his sub-kings. He was put in charge of the area of the Paropamisadae between Bactria and the Indian territories.

The limited size of his coinage indicate a short reign, and it seems that he died at a rather young age before being replaced by his brother Agathocles. Some of his coins (as well as those of Agathocles) have another surprising characteristic: they are made of copper-nickel alloy, a technology that would not be developped in the West until the 18th century, but that was knows by the Chinese at the time. They suggest that exchanges of the metallic alloy, or possibly exchanges of technicians, were happening at the time between China and the region of Bactria.

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Coins of Pantaleon