Cockley Cley postmill is mentioned in Blomefield's History of Norfolk on two occasions that relate top 1240 and 1287. However, it is uncertain whether it is the same mill or two separate ones.

West-Hall Manor (1240)
Henry III ... and in the 24th of the said king ... and in the same year a fine was levied between Brian Fitz Alan, petent and William de Montchensey (whom William le Blouint called to warrant 3 parts of a knight's fee in Cley) except the 20th part released to Warin who regranted to Brian the 3rd part of the said 3 parts ... this 3rd part considted of 297 acres ... the 3rd part of a windmill and watermill ...
Blomefield's History of Norfolk, Vol. VI - Hundred of South Greenhoe

West-Hall Manor (1287)
In the reign of Edward I ... and in the 15th of the said king, Sir William Waleyns was found to be lord and to have ... This Sir William, as appears from old evidences , held one capital messuage, 214 acres of land, 5 of pasture, 18 of heath, liberty of two fald-courses, a free bull and boar, with a windmill, of Sir Robert Valeyns ...
Blomefield's History of Norfolk, Vol. VI - Hundred of South Greenhoe

Copyright © Jonathan Neville 2006