Albert Barnes Commentary 1 Kings 22:45

"Now the rest of the acts of Jehoshaphat, and his might that he showed, and how he warred, are they not written in the book of the chronicles of the kings of Judah?" — 1 Kings 22:45 (ASV)

The book of the chronicles ... - Compare the note on 1 Kings 22:39. The biographer of Jehoshaphat appears to have been Jehu, the son of Hanani (2 Chronicles 20:34).