Maurya Empire
Chandragupta Maurya established the Maurya empire by overthrowing the Nanda dynasty and expanded the empire with the help of Chanakya. By 316 BC , the Maurya empire fully occupied North-Western parts of India, defeating and conquering the governors left by Alexander the Great. Chandragupta Maurya defeated Seleucus I Nicator and gained the territories beyond Indus River.