In the 17th century a French writer claimed to have discovered a vast indigenous realm in the Appalachian Mountains of the American southeast. Could it be true? Register to read more articles for free. When you register, you will receive the History Today newsletter. Click here to read our Terms of Use. Register Already have an account? Sign in. In the 17th century a French writer claimed to have discovered a vast indigenous realm in the Appalachian Mountains of the American southeast. Could it be true?