London two months. The fortifications failed their only test when the New Model Army entered London in 1647, and they were levelled by Parliament the same year. London was plagued by disease in the early 17th century, culminating in the Great Plague of 1665–1666, which killed up to 100,000 people, or a fifth of the population. The Great Fire of London broke out in 1666 in Pudding Lane in the city and quickly swept through the wooden buildings. Rebuilding took over ten years and was supervised by Robert Hooke as Surveyor of London. In 1708 Christopher Wren's masterpiece, St Paul's Cathedral
Great Fire of London were crowded to bursting point, intermingled with these sources of heat, sparks, and pollution, and their construction increased the fire risk. The typical six- or seven-storey timbered London tenement houses had "jetties" (projecting upper floors). They had a narrow footprint at ground level, but maximised their use of land by "encroaching" on the street, as a contemporary observer put it, with the gradually increasing size of their upper storeys. The fire hazard was well perceived when the top jetties all but met across the narrow alleys; "as it does facilitate a conflagration, so does it also hinder the remedy", wrote