Normally the kings will get a name 'thunjiya' in connection with the death. He died at the place called kulamutram. It is not known whether it is a battle field . Correct me if i am wrong.
Yes, it is believed that after second Kariyaru war, Kilivalavan, had chased the Padyian and Cheran towards Chera Nadu and died at Kulamutram at Chera Nadu.
But it is not very clear whether he died at an war or whilst present at this place.