Sometime around c.305 BC, the Greek
geographer and explorer Megasthenes
arrived at the court of the Indian emperor Chandragupta
Maurya at Pataliputra (modern Patna). He was sent as an ambassador by Seleucus Nicator of the Seleucid dynasty,
with whom Chandragupta Maurya had
entered into a treaty and matrimonial alliance. During his stay in India,
Megasthenes compiled the book Indica
- a commentary on the geography, social traditions, and religious customs of
India. Although, the original work of Megasthenes is no longer available, later
Greek historians such as Arrian and Diodorus Siculus have referred to Indica in their works, from where we can
gather snippets of some very important observations made by Megasthenes
regarding the presence of Hercules in India.