A Chandragupta had founded the Mauryan empire in C320; just so did a Chandragupta found the Gupta dynasty in C320. It could be confusing. But the first date was, of course, BC, the second AD; and to clarify matters further, the Gupta Chandragupta is often phonetically dismembered as ‘Chandra-Gupta’ or ‘Chandra Gupta’.
