Note 221 — Chapter X · THE PAPACY AND ITS DANGERS.
S. G. C. (Samuel George Chetwynd) Middlemore translation
Here once for all we refer our readers to Ranke’s Popes, vol. i., and to Sugenheim, Geschichte der Entstehung und Ausbildung des Kirchenstaates. The still later works of Gregorovius and Reumont have also been made use of, and when they offer new facts or views, are quoted. See also Geschichte der römischen Papstthums, W. Wattenbach, Berlin, 1876.