 Written about one hundred years before Abraham ibn Daud, it covers a period (850-1054) our knowledge of which is extremely scanty; the only information hitherto having been obtained from a few inscriptions and from notices in the works of Shabbetai Donolo, who also was a native of Oria.Only one manuscript of the "Chronicle" is known to exist; it is in the library of the cathedral at Toledo, Spain.It bears the title "Sefer Yuhasin" (Book of Genealogies) and is written in the peculiar rhymed prose which the Arab al-Hamadani had, in the Maqama, brought into prominence fifty years before Ahimaaz, and which Hariri perfected fifty years after him