Editing Isleworth (section)

===Transfer to Earldom of Cornwall===
[[File:Arms of Richard of Cornwall, Earl of Cornwall.svg|thumb|left|160px|Coat of arms of Richard, First Earl of Cornwall]]
In 1227, when he took control of England from his childhood regents, [[Henry III of England|Henry III]] seized Isleworth and other property of the St Valeri family and gave the manor to his brother, [[Richard, 1st Earl of Cornwall]]. He built a new moated manor house, which is described in the Black Book of the Exchequer – having a tiled roof, chimney, two bedchambers and an inner courtyard. Beyond the moat was an outer courtyard with a number of buildings for servants and supplies, and a short distance away was a [[watermill]]. 

The exact location of this house is not recorded, but a report of an area long ago known as 'Moated Place' puts the likely place between the Northumberland Arms and Twickenham Road, with the watermill being near Railshead, on the River Crane (not where the traditional Isleworth mill 'Kidd's Mill', because the stream there is artificial and did not exist at that time).<ref name="Make a City Here p68"/> The seemingly classic medieval manor house was burned down during the [[Second Barons' War]] in 1264.