A map of the area from London to the Mouth of the Thames from the time of the foundation of the English Monarchy under Ecgbert (Egbert), King of Wessex (AD 827) to the Norman Conquest (1066). This map shows the city of London in Middlesex, and cities and towns in portions of Hertford, Essex, Surry, and Kent.The map shows rivers, terrain, and the islands of Mersey, Canvey, and the Isle of Sheppey.