[Footnote 209: Among the Epistles of the Popes, see Leo IX.
epist. 3; Gregor. VII. l. i. epist. 22, 23, l. iii. epist.
19, 20, 21; and the criticisms of Pagi, (tom. iv. A.D. 1053,
No. 14, A.D. 1073, No. 13,) who investigates the name and
family of the Moorish prince, with whom the proudest of the
Roman pontiffs so politely corresponds.]