Who founded the Mauryan Empire? State briefly Chanakya's role in founding the Mauryan Empire.

The Mauryan Empire was founded by Chandragupta Maurya.

Chanakya vowed to expel the Greeks from the Indian territory and sought to inspire a number of Indian rulers to unite and fight the Greeks. Chanakya reached out to the ruler of Magadh, Dhanananad to seek his help. Dhanananda insulted Chanakya and removed him from his official position.
On that day Chanakya swore to take revenge on Dhanananda and for this reason he educated and trained Chandragupta to overthrow the Nandas and liberate north-west India from the Greeks.
With Chanakya's help Chandragupta Maurya defeated the Nandas and established the Mauryan Empire.