 This boundary dates back to the Anglo-Saxon kingdoms of Mercia and Northumbria.Sidney Oldall Addy, in his 1888 book on the Sheffield dialect mentions that this stream is called Fenny Brook on the Ordnance Survey map, where it flows past Ringinglow.The brook has long been used as a source of power for local industry; remains of water-powered mills used variously for smelting lead and grinding corn can be seen at Whirlow Wheel and Ryecroft Mill in Ecclesall Woods.