Explanation:

Rock edicts, narrative histories and announcements carved into cliff rock, onto pillars, and in caves throughout India by King Ashoka (reigned c. 265–238 bce), the most powerful emperor of the Mauryan dynasty and a highly influential promulgator of Indian Buddhism. 

Edict 13 on the Edicts of Ashoka Rock Inscriptions reflect the great remorse the king felt after observing the destruction of Kalinga: Basham, Ashoka's personal religion became Buddhism, if not before, then certainly after the Kalinga War.