Poems in a way are spells against death. They are milestones, to see where you were then from where you are now. To perpetuate your feelings, to establish them. If you have in any way touched the central heart of mankind's feelings, you'll survive.
In history, one gathers clues like a detective, tries to present an honest account of what most likely happened, and writes a narrative according to what we know and, where we aren't absolutely sure, what might be most likely to have happened, within the generally accepted rules of evidence and sour