Jamaican Patois, known locally as Patois (Patwa or Patwah) and called Jamaican Creole by linguists, is an English-based creole language with West African influences (a majority of loan words of Akan origin) spoken primarily in Jamaica and the Jamaican diaspora. The language developed in the 17th century, when slaves from West and Central Africa were exposed to, learned and nativized the vernacular and dialectal forms of English spoken by their masters: British English, Scots and Hiberno-English. It exhibits a gradation between more conservative creole forms and forms virtually identical to Standard English (i.e. metropolitan Standard English).