The Complete Peerage is a listing of titles of nobility and their holders from Norman times to the twentieth century (a continuation - Addenda and Corrigenda - to 1995 is also available from amazon.co.uk). The current edition - printing four pages on one to compress the full work into six convenient volumes - is, next to the DNB, the most important reference for British history, and its re-entry into print is long overdue! The information is as accurate as available, and the footnotes are a delight (though the authors follow Dr. Johnson's alleged rule of never giving the Whig dogs the best of it - William III and Home Rule set them foaming at the mouth!) If you are at all interested in British history, get the Complete Peerage...