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".
Scottish Gaelic
However, given there are no longer any monolingual Gaelic speakers, following an appeal in the court case of "Taylor v Haughney" (1982), involving the status of Gaelic in judicial proceedings, the High Court ruled against a general right to use Gaelic in court proceedings.