Mahapadmananda defeated and killed the last of the series of the 32 Kshetriya kings and incorporated Kalinga to his extensive empire. Although Kalinga lost her independence, she became economically prosperous under the Nanda rule. Mahapadmananda undertook irrigation projects to eradicate famine condition in Kalinga. The pre-Mauryan black polished potteries and punch-marked coins having four symbols found in plenty from Asurgarh in Kalahandi district and Sonapur in Bolangir district indicate the flourishing economic condition during the time of the Nanda rule.
After Mahapadmananda his eight sons ruled one after the other and the last Nanda king was overthrown by Chandragupta Maurya who found the Maurya rule in Magadha. During the time of Chandragupta’s rebellion against the last Nanda king, Kalinga declared her self independent and tried to build her strength as an overseas power.