The book is the first attempt at a comprehensive description of the policy pursued by the authorities of the Duchy of Warsaw (1807–1815) towards the Jews. The Duchy was a state straddling two eras, torn between the feudal world and the 19th century’s dreams of progress. It introduced mechanism of modern management, but the old ideas and social attitudes were still very much alive. It is this tension between new regulation and old habits that is the subject of this book.