I'd offer some examples (of movies) rather than leave it so open ended. Try some of the articles on www.DeReMilitari.org - some might be overly academic but there are plenty of more accessible pieces.

There are groups of people who learn actual medieval swordfighting from medieval manuals. You can learn more about it at wma.reddit.com

But, this short film was choreographed by one of them, so it is as authentic as possible: https://www.youtube.com/watch?v=vt7I6H4kNPQ

This is based on the manuals of the Liechtenauer school.

Lindybeige has several videos about that exact topic.