Viraraghava copper plates, dated 1225 CE, of Cochin, or Kottayam plates of Viraraghava Chakravartin, or Syrian Christian copper plate, describe the concession made by the local king Viraraghava to Christian merchant Iravikorttan, the chief of Manikkiramam (Manigiramam) in Makotaiyar Pattinam (modern Kodungallur).
E. Hultzsch
Epigraphica Indica, Volume IV. [V. Venkayya] 1896-97