First and Second Chronicles, originally one book, was written sometime after Judah began to return from the Babylonian exile in 538 b.c. (1 Chron. 9:1-2; 2 Chron. 36:23). It focuses primarily on the history of Judah, the southern kingdom of divided Israel. First Chronicles begins with several genealogies, with special emphasis on David and Solomon. The "chronicler" moves next to the history of the kingdom under David, stressing David's deep interest in worship and his detailed plans for the construction of the temple-which would be built by his son Solomon. First Chronicles was probably written to reassure the returned exiles of God's faithfulness toward his people. Its author is unknown, although many have thought that Ezra was the principal writer.