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In contrast to other answers, I have to say that research is not necessarily required. This is entirely dependent on your intended readership. If you're writing a bodice-ripper set in King Arthur'...
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Source: https://writers.stackexchange.com/a/43146 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
In contrast to other answers, I have to say that research is not necessarily required. This is entirely dependent on your intended readership. If you're writing a bodice-ripper set in King Arthur's Court, well, research won't help you much and may well get in the way. Your audience probably doesn't know and doesn't care that life in them times was nasty, brutal, and short, and that chivalry was widely admired and just as widely ignored. Inconsequential details like universal fleas and lice will just get in the way of the story. The charming custom of bathing once a year probably won't help with modern readers, either - at least not the sort who read bodice-rippers. In fact, what you need to do in this case is no research at all on what life was like back then, but rather concentrate on the knowing the preconceptions of your audience. What you need to do above all else is to learn what the audience will and will not accept. Accuracy is entirely optional. Acceptable verisimilitude is not.