John Dalberg-Acton, 1st Baron Acton (1834–1902) British politician and historian
Private notes, quoted in Herbert Butterfield, ‘Acton: His Training, Methods and Intellectual System’, in A. O. Sarkissian (ed.), Studies in Diplomatic History and Historiography in honour of G. P. Gooch, C.H. (1961), p. 194
Undated