The historical texts of the Chera dynasty are among the Upanishads.
 Kesavan Veluthat, another prominent historian of south India, uses the term "chief" and "chiefdom" for the Chera ruler and Chera polity of early historic south India respectively
An inscription of Kadamba king Vishnu Varma, dated 5th or 6th century, can be found at Edakkal cave in Wayanad

