(Just had to pass this along!)
St. Peter Damian, writing to Pope Nickolas II, (A.D. 1059), “deplores the situation in which bishops live in public concubinage to the scandal of some, and to the delight of others who ridicule the leadership of the Church on this account” (p. 3).
Listen to how St. Damian, himself a Reformer, speaks of the singular dignity of the Roman Pontiff:
But you, my lord and venerable pope, you who take the place of Christ, and the successor to the supreme shepherd in apostolic dignity, do not through sloth allow this pestilence to grow, do not by conniving and dissimulation loosen the reigns on this raging impurity. – Letter 61:14
Peter Damian: Letters 61-90 (Fathers of the Church, Medieval Continuation), Owen J. Blum, trs., Catholic University of America Press, 1992, ISBN 0813207509, p. 12
This entire letter (or at least as much as Google books allows) ought to be read and studied. A bit pricey, but the book is well worth purchasing too. Contains some great historical info.