They way one does research into nonexistent history is to tell the story and find out what happened. I believe this isn't very different from what historians of the so-called real world do. Even if we are present at some historic event, so we comprehend it - can we even remember it - until we can tell it as a story? And for events in times or places outside our own experience, we have nothing to go on but the stories other people tell us. Past events exist, after all, only in memory, which is a form of imagination. The event is real , but once it's , its continuing reality is entirely up to us, dependent on our energy and honesty. If we let it drop from memory, only imagination can restore the least glimmer of it. If we lie about the past, forcing it to tell a story we want it to tell, to mean what we want it to mean, it loses its reality, becomes a fake. To bring the past along with us through time in the hold-alls of myth and history is a heavy undertaking; but as Lao Tzu says, wise people march along with the baggage wagons.