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".
Suibne mac Cináeda
The Gaelic "Gaidheal" (plural "Gaidheil") is primarily a linguistic term referring to speakers of Gaelic. The Gaelic term "Gall Gaidheil", literally meaning "Stranger-"Gaidheil"", first appears on record in the mid-ninth century. At this period in time, the term "Gall" (plural "Gaill") referred to Scandinavians, which indicates that "Gall Gaidheil" should be taken to mean "Scandinavian-"Gaidheil"". The term appears to have been applied to a population of mixed Scandinavian and Gaelic ethnicity in the Hebrides and part of the former kingdom of Dál Riata. The leader of the "Gall Gaidheil" in the mid part of the century appears to have been a certain Caittil Find—possibly identical to Ketill Flatnefr of Scandinavian saga tradition—who may have been seated in the Hebrides. If the little that is known of Caittil and his connection with the "Gall Gaidheil" is correct, it could be evidence that Suibne was a Hebridean chieftain as well.