The Roman Empire, attacked the barbarians, and is experiencing severe internal contradictions, was gradually abandoned their outposts in distant lands. Of Britain the Romans left in 410 ad With the fall of the same Roman Empire, London and the Thames gradually emptied, and the trade went into decline. Up to the invasion of William the Conqueror in the XI century Anglo-Saxon kings crowned at Kingston — settlement 19 miles from London up the river where you can Wade across. William the Conqueror, after his coronation at Westminster in 1066, was built on the site of the once Roman city, the fortress known as the tower of London. He wanted to strengthen his authority and to facilitate trade, as well as control the approaches to the port. Trade once again flourished, and the population of London has increased to tens of thousands.
Approximately 35 kilometers West of London, on limestone rocks, William the Conqueror built another fortress — Windsor. Later it became the residence of the English kings.