The serpent king (Nagaraja) idol dates back to the 6th or 8th Century and is believed to be from Rajasthan or Madhya Pradesh. The 'Dwarapalas' from Tamil Nadu is said to be from the 15th century.
The state government and Pon Manickavel have been at loggerheads with each other for a while. The government had tried to transfer all cases of the idol wing to the CBI citing the IG’s 'unsatisfactory performance'.