Mwyllin y Sayle was a horizontal or a 'side-shot' mill which were reportedly still visible neath Ballacottier some years ago.  A number of sources give conflicting locations for the mill, but in reality its location is not accurately recorded.


Woods atlas shows 'mill rent' at NGR SC 246774. W. Cubbon believed that the site was at NGR SC 235761. Gill gives the site at the foot of Glen Dhoo between Arrysey and Ballacottier and Kneen.


Norse place-names associated with this type of mill in other parts of the island prove that horizontal mills were well-established at least by the 13th century, when Norse rule ended.