Greco-Buddhist interaction (2nd c. BCE–1st c. CE)

In the areas west of the Indian subcontinent, neighboring Greek kingdoms had been in place in Bactria (today's northern Afghanistan) since the time of the conquests of Alexander the Great around 326 BCE: first the Seleucids from around 323 BCE, then the Greco-Bactrian kingdom from around 250 BCE.

The Greco-Bactrian king Demetrius I invaded India in 180 BCE as far as Pataliputra, establishing an Indo-Greek kingdom that was to last in various part of northern India until the end of the 1st century BCE. Buddhism flourished under the Indo-Greek kings, and it has been suggested that their invasion of India was intended to show their support for the Mauryan empire, and to protect the Buddhist faith from the alleged religious persecutions of the Sungas (185–73 BCE).
One of the most famous Indo-Greek kings is Menander (reigned c. 160–135 BCE). He apparently converted to Buddhism and is presented in the Mahayana tradition as one of the great benefactors of the faith, on a par with king Ashoka or the later Kushan king Kanishka. Menander's coins bear the mention "Saviour king" in Greek, and sometimes designs of the eight-spoked wheel. Direct cultural exchange is also suggested by the dialogue of the Milinda Panha between Menander and the monk Nagasena around 160 BCE. Upon his death, the honour of sharing his remains was claimed by the cities under his rule, and they were enshrined in stupas, in a parallel with the historic Buddha (Plutarch, Praec. reip. ger. 28, 6). Several of Menander's Indo-Greek successors inscribed the mention "Follower of the Dharma" in the Kharoshthi script on their coins, and depicted themselves or their divinities forming the vitarka mudra.

The interaction between Greek and Buddhist cultures may have had some influence on the evolution of Mahayana, as the faith developed its sophisticated philosophical approach and a man-god treatment of the Buddha somewhat reminiscent of Hellenic gods. It is also around that time that the first anthropomorphic representations of the Buddha are found, often in realistic Greco-Buddhist style: "One might regard the classical influence as including the general idea of representing a man-god in this purely human form, which was of course well familiar in the West, and it is very likely that the example of westerner's treatment of their gods was indeed an important factor in the innovation" (Boardman, "The Diffusion of Classical Art in Antiquity" ).