2 Samuel 8:16

And Joab the son of Zeruiah was over the host; and Jehoshaphat the son of Ahilud was recorder;

Joab ... was over the host - by virtue of a special promise (2 Samuel 5:8). Recorder - historiographer or daily annalist, whose duty it was to register current events of interest and importance in the kings' reigns-an office of great trust and importance in Eastern countries (Herodotus b. 6:, ch. 100:; b. 7:, ch. 9; Morier's 'Persia').