The most important achievement of Shishunaga was ____.
defeating Avanti (Malwa) and annexing it to Magadh
The question asks for the most important achievement of Shishunaga, the founder of the Shishunaga dynasty of Magadha.
Shishunaga rose to power around 413 BCE in Magadha, one of the strongest of the sixteen Mahajanapadas of ancient India, establishing his own dynasty in place of the discredited later Haryanka rulers.
His most significant success was breaking the power of Avanti, a rival and powerful Mahajanapada centred on Ujjain in Malwa (western India) that had long competed with Magadha for supremacy in the Gangetic and central Indian region.
He defeated Avanti and annexed it to Magadha, thereby ending a rivalry that had lasted for generations and greatly extending Magadhan territory towards the west.
This annexation was decisive in the steady expansion that would eventually make Magadha the nucleus of the vast Mauryan Empire.
The other options belong to different rulers: the conquest of Kalinga is associated with the Mauryan emperor Ashoka, the first Buddhist council with the reign of Ajatashatru, and the building of the Pataliputra fort is not credited to Shishunaga, so all three are incorrect.
Hence, his key achievement was defeating Avanti (Malwa) and annexing it to Magadh.
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