Analysis of information sources in references of the Wikipedia article "Đế quốc Maurya" in Vietnamese language version.
the only direct evidence throwing light....is that of Jain tradition. ...it may be that he embraced Jainism towards the end of his reign. ...after much consideration I am inclined to accept the main facts as affirmed by tradition.... no alternative account exists.
It was here, in the third century BC, that the first Emperor of India, Chandragupta Maurya, embraced the Jain religion and died through a self-imposed fast to the death,......
In the past it was not uncommon for historians to conflate the vast space thus outlined with the oppressive realm described in the Arthashastra and to posit one of the earliest and certainly one of the largest totalitarian regimes in all of history. Such a picture is no longer considered believable; at present what is taken to be the realm of Ashoka is a discontinuous set of several core regions separated by very large areas occupied by relatively autonomous peoples.
The geography of the Mauryan Empire resembled a spider with a small dense body and long spindly legs. The highest echelons of imperial society lived in the inner circle composed of the ruler, his immediate family, other relatives, and close allies, who formed a dynastic core. Outside the core, empire travelled stringy routes dotted with armed cities. ... In most janapadas, the Mauryan Empire consisted of strategic urban sites connected loosely to vast hinterlands through lineages and local elites who were there when the Mauryas arrived and were still in control when they left.
Magadha power came to extend over the main cities and communication routes of the Ganges basin. Then, under Chandragupta Maurya (c.321–297 bce), and subsequently Ashoka his grandson, Pataliputra became the centre of the loose-knit Mauryan 'Empire' which during Ashoka's reign (c.268–232 bce) briefly had a presence throughout the main urban centres and arteries of the subcontinent, except for the extreme south.