As seen in their earliest historical documents (especially portions of the Book of Judges), the Hebrews are a group of agricultural and pastoral but warlike tribes of Semitic speech, with household Gods and local deities, [339] living among communities at the same or a higher culture stage. Their ancestral legends show similar religious practice. [340] Of the Hebrew tribes some may have sojourned for a time in Egypt; but this is uncertain, the written record being a late and in large part deliberately fictitious construction. [341] At one time twelve such tribes may have confederated, in conformity with a common ancient superstition, seen in Arab and Greek history as well as in the Jewish, as to the number twelve. As they advanced in civilization, on a basis of city life existing among a population settled in Canaan before them, parts of which they conquered, one of their public cults, that of Yahu or Yahweh, finally fixed at Jerusalem, became politically important. The special worshippers of this God (supposed to have been at first a Thunder-God or Nature-God) [342] were in that sense monotheists; but not otherwise than kindred neighbouring communities such as the Ammonites and Moabites and Edomites, each of which had its special God, like the cities of Babylonia and Egypt. But that the earlier conceptions of the people had assumed a multiplicity of Gods is clear from the fact that even in the later literary efforts to impose the sole cult of Yahweh on the people, the plural name Elohim, "Powers" or "Gods" (in general, things to be feared), [343] is retained, either alone or with that of Yahweh prefixed, though cosmology had previously been written in Yahweh's name. The Yahwists did not scruple to combine an Elohistic narrative, varying from theirs in cosmology and otherwise, with their own. [344]