Along with the Pallava king Simhavishnu, he is credited with ending the Kalabhra rule, marking the beginning of a new era in the Tamil speaking region.
[3] Most historians, including R. C. Majumdar, state the period of Kadunkon rule as 590–620 CE.
[4][5][6][7] The Sangam literature mentions the early Pandya dynasty, which is believed to have gone into obscurity during the Kalabhra interregnum.
[13] Most of the knowledge about him comes from the Velvikudi inscription of the Pandya king Parantaka Nedunchadaiyan (also Nedunjadaiyan or Nedunchezhiyan).
According to this inscription, Kadunkon defeated several petty chieftains and destroyed "the bright cities of unbending foes".