Analysis of information sources in references of the Wikipedia article "Shaishunaga dynasty" in English language version.
...the people of Magadha drove out the ruling family and elected an amatya (a high-ranking official) named Shishunaga as king. Shishunaga seems to have had a second capital at Vaishali (according to the Mahavamsatika, he was the son of a Lichchhavi raja of Vaishali). He succeeded in destroying the power of the Pradyota dynasty of Avanti.