Galwegian Gaelic
George Buchanan, himself a Gaelic speaker, writing in 1575, reported that Gaelic was still spoken in Galloway. In the middle of the century, 1563–1566, an anonymous English military investigator reported that the people of Carrick "for the most part specke erishe".
Language shift
Gaelic has long suffered from its lack of use in educational and administrative contexts and was long suppressed. The shift from Gaelic to Scots and Scottish English has been ongoing since about 1200 CE; Gaelic has gone from being the dominant language in almost all areas of modern-day Scotland to an endangered language spoken by only about 1% of the population.