[1] It contains little Spanish history; the first 14 sections contain very brief mentions of the Visigothic kings up to the reign of Suintila (621-631), taken from the Historia de regibus Gothorum, Vandalorum et Suevorum of Isidore of Seville.
The remainder of the content consists of alternating sections dealing with the Byzantine Emperors and the parallel leaders of the Arabs beginning with Muhammad.
These sections perhaps derive from the Chronicon Mundi of John of Nikiû and from Arabic or Syriac works which have not survived.
Some of these sections contain very brief mentions in passing, of the Arab invasions of North Africa, Spain, France, and parts of the Middle East.
The date of the work cannot be earlier than 741, as it mentions the Byzantine Emperor Leo III and the length of his reign which terminated in that year.