The writer of history, I believe, has a number of duties vis-à-vis the reader, if he wants to keep him reading. The first is to distill. He must do the preliminary work for the reader, assemble the information, make sense of it, select the essential, discard the irrelevant- above all, discard the irrelevant - and put the rest together so that it forms a developing dramatic narrative. Narrative, it has been said , is the lifeblood of history. To offer a mass of undigested facts, of names not identified and places not located, is of no use to the reader and is simple laziness on the part of the author, or pedantry to show how much he has read.
Barbara W. Tuchman, Practicing History:  Selected Essays
history, politics