The title of this Paper, which was suggested to the present writer many months ago, was framed in rather vague terms in order to afford him an opportunity of selecting a particular topic at his leisure. It would be no easy matter to deal with the whole subject,—to catch in a single lecture the spirit of mediæval London, or to speak adequately of a mass of Records, which even for this restricted period, are very numerous. Happily, as regards the latter, something has already been done. Some sixty years ago Mr. H. T. Riley contributed to the Rolls series four volumes containing the essential matters in the Liber Custumarum and Liber Albus, two custumals of the fourteenth and fifteenth centuries, which are a treasury of information for the student; a life's work, directed by fine scholarship, is represented in Dr. R. R. Sharpe's Calendars of Wills in the Court of Husting, his Calendars of Coroner's Rolls and Mayor's Correspondence, and the nine volumes of Letter Books abstracted by him; and other portions of the City's Records have been freely quoted in standard works on social, political and economic history. In view, therefore, of the abundance of evidence available for those well qualified to interpret it, I trust you will allow me to take a narrower and more modest subject, yet within the wide boundaries of the title given.