She wore spiked armour, and liked to grab enemies in battle and impale them.
I haven't had much luck googling, but she'd be make a good strip, I reckon. Does this ring any bells?
Later: Just remembered. She was married to Strongbow the Norman. Wish I could find that book. I don't remember the author or title, or anything, but it was full of cool watercolours of stormswept castles and romantically weird caharacters of Olde Ireland. I guess my sister chucked it with so many intriguing things when she cleared 'Heart Attack House' (as we called it), after my mother's death.
Stray doodle; can't remember if I've posted it before...