Malaterra remarks the foundation of the bishoprics, (l. iv. c. 7,) and produces the original of the bull, (l. iv. c. 29.) Giannone gives a rational idea of this privilege, and the tribunal of the monarchy of Sicily, (tom. ii. p. 95 - 102;) and St. Marc (Abrege, tom. iii. p. 217 - 301, 1st column) labors the case with the diligence of a Sicilian lawyer.