I think I see our ancient mother Caledonia, like Caesar, sitting in the midst of our senate, ruefully looking round about her, covering herself with her royal garment, attending the fatal blow, and breathing out her last with an ‘Et tu quoque mi fili.’
Source, in full
Speech in the Scottish Parliament against the Act of Union (2 November 1706), quoted in ‘Appendix to Vol. VI. No. I’, The Parliamentary History of England from the Earliest Period to the Year 1803, Vol. VI. A.D. 1702–1714 (1806), column 143