However , contacts were kept with his Greco - Iranian neighbours in the Seleucid Empire .
The Indian emperor Chandragupta Maurya , founder of the Maurya Empire , re-conquered around 322 BC the northwest Indian territory that had been lost to Alexander the Great .
Contacts were kept with Alexander the Great 's Greco - Iranian neighbours in the Seleucid Empire .
The Indian emperor Chandragupta Maurya , founder of the Maurya Empire , re-conquered around 322 BC the northwest Indian territory that had been lost to Alexander the Great .