I actually think that'd be a good idea. it'd be cool for characters who don't use magic. like a pirate. pirates are still middle age-ish so i think it'd fit in perfectly fine.
No, no they are not. "Pirates", as in the type that is stereotypically associated with the word, are from the 17th and 18th centuries...well into the modern era. Pirates of the Middle Ages looked like armored soldiers and used crossbows, bows, and whatever other melee weapon thy preferred.
Nexuslg: Dark Age is part of the Middle Ages, but the Middle Ages are not the Dark Ages
Dark Age (Early Middle Ages): Fall of last Roman Emperor until end of Viking Age (476-1050/66)
High Middle Ages: 1050-1350
Late Middle Ages: 1350-1492(ish)