I want to have the details of a long and brutal war almost entirely forgotten in my fantasy story. It's a rural society where pretty much only the priests can read and write. If the priests burned everything they written about this war, how quickly would the truth get lost? I read too much bad fantasy where people either have an insane amount of details or important knowledge has disappeared when it shouldn't. I want to avoid making too blatant mistakes, but I'm not sure how to google this question, so I decided to ask what you think.