Buddhism prospered under the Indo - Greek kings .
Buddhism has been suggested that kings ' invasion of India was intended to protect the Buddhism faith from the religious persecutions of the Shungas ( 185 -- 73 BC ) , who had overthrown the Mauryans .
Buddhism prospered under the Indo - Greek kings , and it has been suggested that their invasion of India was intended to protect the Buddhist faith from the religious persecutions of the Shungas ( 185 -- 73 BC ) , who had overthrown the Mauryans .