1) The OED defines a rough mason as one who built only with unhewn stone, and examples of the word are given from 1444. Yorkshire references show that some men so described were dry-stone wallers.
1579 Anthony Whiteheade of Emmotte and John Reade, roughemasons, Elland
1612 Oswold Collyson, waller or rough maison, Birdforth
1629 Richard Walker of Birstall, rough mason. However, the term is much older than that, and several rough masons are named in the York freemen’s rolls, for example: 1379 Rad. de Holdernesse, rughmason.