The twenty-first lecture in Doug Allen's History of Urban Form series addresses London, England, and that city's pattern of residential squares. It resumes the discussion of Europe in the Renaissance-era, but explores the differences that made English and British urban patterns unique. It begins with a history of London, the development of the Inns of Court, the impact of the Great Fire of 1666, the importation (and lack of implementation) of Renaissance cities, and the influence of London residential squares on later cities.