1776 non-fiction books 1781 non-fiction books 1788 non-fiction books 1789 non-fiction books 18th-century history books Book series introduced in 1776 Books about civilizations Books critical of Christianity Books critical of Islam Declinism English non-fiction books Fall of the Western Roman Empire Gothic Wars books History books about ancient Rome History books about the Byzantine Empire Non-Islamic Islam studies literature Works about the theory of history Works by Edward Gibbon