[83] Mills mentions one from Manuel VII. to Pope Gregory VII., and Guibert of Nogent speaks of another which, though he cautiously avoids naming the emperor who wrote it, lest he should mislead from want of correct information, could only have been sent, under some of the circumstances he mentions, by Isaac Comnenus. Mills supposes it to have been the same with a letter written by Alexius, though it differs in many parts from the usual version of that epistle. Probably, however, this opinion is correct, as a letter is stated to have been addressed to Robert of Flanders, who was in his extreme youth in the time of Isaac Comnenus.
[84] Murator. Script. Ital.
[85] Albert of Aix; William of Tyre.
[86] Ibid.
[87] Robert, lib. i.
[88] Guib. Nogent, lib. ii.
[89] Hist. Hieros. abrev. Jacob. Vit. lib. i.
[90] Will. Tyr. lib. i.; Albert. Chron. Hieros.
[91] Will. Tyr.; Hist. Hieros.; Jacob. Vit. lib. i.
[92] Will. Tyr. lib. i.