First kings to issue Gold coin in India:

Indo-Greeks:

• Indo-Greek rule is important in the history of India because of the large number of coins that the Greeks issued.
• The Indo-Greeks were the first rulers in India to issue coins that can be definitively attributed to particular kings. This is not possible in the case of the early punch-marked coins, which cannot be assigned with certainty to any particular dynasty. 
• The Indo-Greeks were also the first to issue gold coins in India, and these increased in number under the Kushans.
• Greek rule introduced features of Hellenistic art in the northwest frontier of India, but this was not purely Greek but the outcome of Greek contact with non-Greek conquered peoples after Alexander’s death. The best example of this was Gandhara art.

Additional Information

The most famous Indo-Greek ruler was Menander (165–45 BC), also known as Milinda.

• He had his capital at Sakala (modern Sialkot) in the Punjab; and invaded the Ganga–Yamuna doab.
• He had a great many cities in his dominions including Sakala and Mathura. 
• He is known for the variety and widespread of coins in his dominions.
• He was converted to Buddhism by Nagasena, who is also known as Nagarjuna.
• Menander asked Nagasena many questions relating to Buddhism.
• These questions and Nagasena’s answers were recorded in the form of a book known as Milinda Panho or the Questions of Milinda.