IT is curious that in these days of historical research so little has been written about Rupert of the Rhine, a man whose personality was striking, whose career was full of exciting adventure, and for whose biography an immense amount of material is available. His name is known to most people in connection with the English Civil War, many have met with him in the pages of fiction, some imagine him to have been the inventor of mezzotint engraving, and a few know that he was Admi ral of England under Charles II. But very few indeed could tell who he was, and where and how he lived, before and after the Civil War. The present work is an attempt to sketch the character and career of this remarkable man; the history of the Civil War, except so far as it concerns the Prince, forming no part of its scope. Nevertheless, the study of Prince Rupert's personal career throws valuable side-lights on the history of the war, and especially upon the internal dis sensions which tore the Royalist party to pieces and were a principal cause of its ultimate collapse. From Rupert's adventures and correspondence we also learn much con cerning the life of the exiled Stuarts during the years of the Commonwealth; while his post-restoration history is closely connected with the Naval Affairs of England.