From the author's evident interest in the ritual of the temple, and especially its song service, it would appear that he belonged to one of the guilds of temple singers that became prominent in the post-exilic period. His history centres about the sanctuary and its services. Since Judah, not Israel, is the land of the temple, Northern Israel is almost completely ignored. Like the late priestly historians, his chief aim is to trace the origin of the ceremonial institutions back to the beginnings of Hebrew history. Thus he represents the song service and the guilds of singers as having been established in the days of David. Living as he did under the glamour of the great Persian and Greek empires, he, in common with his contemporaries, idealized the past glories of his race. As we compare his versions of early events with the older parallel accounts of Samuel and Kings, we find that iron has become gold, and hundreds have become thousands, and defeats are transformed into victories. No mention is made of the crimes of such kings as David and Solomon, since they are venerated profoundly as the founders of the temple. [Sidenote: _Sources of I and II Chronicles_] The basis of I and II Chronicles is the prophetic history of Samuel and Kings; from these the author quotes _verbatim_ chapter after chapter, according as their contents are adapted to his purpose. This groundwork he supplements by introducing the priestly traditions current in his own day. Possibly he quotes also from certain somewhat earlier written collections of traditions, for to those, following the example of the author of Kings, he frequently refers his readers for further information. In some cases these later traditions may have preserved authentic, supplemental data; but when the representation of Chronicles differs, as it frequently does, from that of Samuel and Kings, the older and more sober prophetic history is undoubtedly to be followed. [Sidenote: _The older sources quoted in Ezra-Nehemiah_]