 According to some sources it was built in the year 924 by Edward the Elder, who also established the main burh.The purpose of its erection appears to have been as a measure against the Mercian invasion.According to the "Anglo-Saxon Chronicle", Edward marched into peakland after he had fortified Nottinghamshire, and from there onward he arrived at Bakewell, and commanded that a town with a garrison be established at this location.