The Nanda dynasty ruled in northern part of the Indian subcontinent during the 4th century BCE, and possibly during the 5th century BCE. In 326 BC, Alexander invaded India, after crossing the river Indus he advanced towards Taxila.
Fa-hein, the first Chinese Buddhist traveller and monk, came to India during the reign of Gupta emperor Chandragupta II and wrote the book “Si- Yu-Ki” that gives the detail account of the political and social condition of that time.