El Viejo Dragon makes a 90mm figure set with a ludicrously bare chested woman wearing armor, riding a caparisoned horse. Is that the one you're thinking of?
The only other ideas I have is the few Joan of Arc figures out there, but none are mounted.
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
A good friend will come and bail you out of jail...but, a true friend will be sitting next to you saying, "Damn...that was fun!"