These sieges are related, each in its proper place, in the great history of William of Tyre, from the ixth to the xviiith book, and more briefly told by Bernardus Thesaurarius, (de Acquisitione Terrae Sanctae, c. 89 - 98, p. 732 - 740.) Some domestic facts are celebrated in the Chronicles of Pisa, Genoa, and Venice, in the vith, ixth, and xiith tomes of Muratori.