They set then to work, narrating first some years from the Jewish history (drawn mainly from the Bible, Flavius Josephus, and Petrus Comestor), then all things happened in the same years in other cultural circles, such as Egypt, Greece, Carthage or Rome. For these contents, the sources are more numerous. The Alfonsine redactors did not maintain a strict distinction between historical and non-historical works, and treated mythological material, such as Ovid’s "Metamorphoses", as history. Therein they were guided by the euhemeristic interpretation of myths, following which they thought gods and goddesses were in reality old kings, queens and heroes, worshipped as deities after their deaths. The second unit in the organisation of the work, following the "parte" (part), is the one that wears the name of a biblical book: for example, the section in the first “parte” labelled as Éxodo (Exodus) contains the translation (with glosses and commentaries) of this book from the Bible "and" the history of all things happened at the same time in the whole world (among them, the beginnings of Athens). This textual behaviour begins to waver in the fourth “parte”, which covers the first half of the fifth age, after the Babylonian captivity (590 a. C.). Once the Jewish people have lost their “señorío” (political independence), the chronology is no longer guided by a Jewish ruler, but by the ruler of the most important empire (i. e. first Babylon, then Carthage, Macedonia and Rome); the name of the biblical books is likewise no more a cover for all world happenings of a period, but contains only the translation of that book, whereas the name of a “heathen” (gentil) ruler (e. g. Nabucodonosor / Nebuchadnezzar) gives their title to textual units where other material is also contained. Inside the biblical books or the section dedicated to the reign of a ruler, the following unit is the “libro” (book), which comprises from four or five until 80 or 90 “capítulos” (chapters). Not all biblical books are divided into minor books, many are directly organised in “capítulos” (the first procedure is usual for the First and Second parts, the last for the Third and Fourth).