…people were liable to write stuff down. Important things got written down more often and by more people. This provides for us a fascinating possibility: rather than guessing or making up stories about what happened in the past and what people thought and did abou t it, we can read what the people at the time had to say! How cool is that?
Mike Flynn has done a bit of this. Read and be edified.
Of course, if you like making stuff up and then reacting with extreme umbrage when people point out you’ve merely created a fantasy world untethered to reality – Dan Brown, talking to you – this whole ‘history’ stuff might not be for you. But give it a try, you may like it.