History: London, England, United Kingdom

During the 12th century the institutions of central government, which had hitherto accompanied the royal court as it moved around the country, grew in size and sophistication and became increasingly fixed in one place. In most cases this was Westminster, although the royal treasury, having been moved from Winchester, came to rest in the Tower. While the City of Westminster developed into a true capital in governmental terms, its distinct neighbour, the City of London, remained England's largest city and principal commercial centre and flourished under its own unique administration, the Corporation of London. In 1100 its population was around 18,000; by 1300 it had grown to nearly 100,000.
Disaster struck during the Black Death in the mid-14th century, when London lost nearly a third of its population. Apart from the invasion during the Peasants' Revolt in 1381, London remained relatively untouched by the various civil wars during the Middle Ages.