 The earliest reference to the chief and chiefdom of Eranadu is the Cochin Jewish copper plate (c. 1000 AD).Old Malayalam inscriptions name two titles for the rulers of Eranadu - Manvepala Manaviyata ( c. 11 century) and Manavikrama (c. 12th century).In the later period, Manavikrama, Manaveda and Viraraya were the only names given to male members in the royal family, the Samoothiri always being known as Manavikrama.