I will answer you by quoting what I have read, somewhere or other, in Dionysius Halicarnassensis. I think that history is philosophy teaching by examples. Bolingbroke.On the Study and Use of History. Letter II. Vol. III. Page 323.
There is a history in all mens lives, Figuring the nature of the time deceasd; The which observd, a man may prophesy, With a near aim, of the main chance of things As yet not come to life; which in their seeds, And weak beginnings, lie intreasured. Shakespeare.King Henry IV., Part II. Act III. Scene 1. (Warwick to King Henry.)