Okay...wow....I need some kind of form for this...it is the third time I have answered this in two days.
First of all, please use the search function for History of Fire Spinning. There have been numerous threads on this in the past.
Next, NYC is quite right in advising you to choose one tool or art to persue. The history of all of them is too varied.
As for fire juggling in the dark ages, that is a myth. Realistically concider what would need to happen for it. There would have to be fuels and fire readily available to bust them out. Troubedors, Fakirs and other such travelling entertainers did not have the means to support such entertainments. It was completely impractical for something that was play.
However, if you look at Samoan Fire Knives (very basically, imbalanced staves), Meteor Bowls (the weapon which is now known as a circus art), or Fire eating/breathing you will find more history on.
There is a native tribe, I believe in Africa, which also grabs big sticks from the fire and wings them around, even doing a basic weave, for ceremonial purposes. I've seen it on video. When I remember who and where, I'll post it up, but again, there is not alot of documented history of it. But at least there is footage. *shrug*
I have books with this stuff in them, but am packed to move in a couple weeks...argh! Otherwise I might have some more resources for you.
Anyway...please do a search and see what else you come up with.
_________________________
Pele
Higher, higher burning fire...making music like a choir
"Oooh look! A pub!" -exclaimed after recovering from a stupid fall
"And for the decadence of art, nothing beats a roaring fire." -TMK