In about 261 BCE, eight years into his reign, Ashoka conquered Kalinga, the last major independent kingdom on the eastern seaboard of the subcontinent. His Major Rock Edict 13 states that 150,000 people were deported, 100,000 were killed and many times that number died of other causes, and presents the emperor's remorse at this suffering as the turning point that led him to renounce conquest by arms in favour of 'conquest by dharma'. The edict is the earliest surviving self-reported deportation figure in South Asian history and one of the very few ancient texts in which a ruler records the human cost of his own campaign as a reproach to himself. Because the numbers exist only in Ashoka's own inscriptions and no other account of the war survives, they cannot be verified; historians differ over whether the remorseful framing makes them more credible than a typical victory monument or simply gives them a different rhetorical purpose. Kalinga remained part of the Mauryan empire, and Ashoka's separate Kalinga edicts address the administration of the conquered province.
The Mauryan emperor Ashoka conquered and annexed the eastern Indian kingdom of Kalinga, and his own inscriptions record the deportation of 150,000 people
There is no basis for a figure. Ashoka's Thirteenth Major Rock Edict — the only quantitative source — states that 100,000 were killed, 150,000 deported and many times that number died afterwards, but there is no census, tax register or settlement survey against which to set those claims, and estimates of Mauryan India's total population (on the order of 100 million by some reconstructions, far less by others) cannot be disaggregated to Kalinga.
The figure of 100,000 killed, with unspecified further deaths from associated causes, is Ashoka's own statement in Major Rock Edict 13 and has no independent corroboration; it is reported here as a single claimed value rather than as a scholarly range.
Ashoka's Major Rock Edict 13 is itself the source documenting the killing and deportation carried out in his campaign.
India