Historical records regarding the origin of the Zamorin of Calicut are obscure. However, it is generally agreed among historians the Eradis were originally the autonomous rulers of Eralnadu/Eranadu region of the Kodungallur Chera kingdom.[1][1][3] The Kodungallur Chera kingdom was a congeries of chiefdoms, which were ruled by local chiefs. The office of the chief/senior prince of Eranad (Eralanadu Utaya) is assumed to be the hereditary.[5][1] The earliest reference to the chief and chiefdom of Eranad is the Cochin Jewish copper plate (c.