In the Man Booker prize-winning short novel, "The Sense of an Ending," by Julian Barnes, there appears the following perceptive answer by a brilliant student to the question, "What is History?" The student quotes, "History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation."
***History at best, therefore, is always somewhat less than a certainty.
A galactic truth, uncertainly, like '42', (an answer to life, the universe, and everything.)*
*Wikipee Douglas Adams for even more uncertainty.