Accounts of foreign travelers are a crucial topic. Create a list matching the traveler (e.g., Megasthenes, Fa-Hien, Hiuen Tsang), the ruler they visited (e.g., Chandragupta Maurya, Chandragupta II, Harshavardhana), and their written work.
The book 'Indica' was written by Megasthenes. He was a Greek ambassador, historian, and ethnographer sent by the Hellenistic king Seleucus I Nicator to the court of the Mauryan emperor Chandragupta Maurya in Pataliputra. His work, although now lost in its original form, survives through fragments quoted by later Greek and Roman authors and provides a valuable account of India during that period.