Stable Diffusion

Hi there, I'm trying to get (more or less) historically accurate images from the early and high middle ages, but none of the models seems to have a grasp of what "maille armor" or "bucket helmets" are and I either get complete garbage or fantasy armor that mostly resembles the early modern period (the stereotypical shining knight armor).

I assume a Lora, trained on images of the armor and weapons I'd like to include, could fix this problem. I found some neat tutorials for making Lora's and think I'll give it a shot.

Do any of you have experience in making these kinds of style Lora's? What should I take care of? I will be manually downloading images that fit my aestethic and manually tag them - how many images should I use? Any input here is highly appreciated.