[Footnote 58: Our best fund for the history of Jerusalem
from Heraclius to the crusades is contained in two large and
original passages of William archbishop of Tyre, (l. i. c. 1
- 10, l. xviii. c. 5, 6,) the principal author of the Gesta
Dei per Francos. M. De Guignes has composed a very learned
Memoire sur le Commerce des Francois dans le de Levant avant
les Croisades, &c. (Mem. de l'Academie des Inscriptions,
tom. xxxvii. p. 467 - 500.)]