In history, the ones who recorded events and dates and wrote the stories altogether were mostly people who were hired to write about it. They were employed by generals, kings, queens -powerful people. Of course, hiring a scribe to write your history comes with a special perk. You can SUGGEST things. You can suggest that they downplay your defeats and shameful moments or erase it altogether. You can also suggest to exaggerate and heroize specific moments of triumph and greatness.