The War of the Rohirrim: Anime Middle-earth

[William Cloud Hicklin]

... but on reading the Wikipedia article they have put a lot of thought into her. She's apparently based on Æthelflæd, Lady of the Mercians, who fought off the Vikings for seven years.

Except Aethelflaed wasn't out swinging a sword. Like many "warrior" queens (Elizabeth I, Elizabeth the Great, Galadriel) she had a keen mind for strategy, but wasn't personally bashing people with cutlery. I'm not sure if I can come up with a historical warrior queen in Europe, although frankly we don't know enough about Boudicca to say one way or the other (sorry, Vikings fans, Lagertha was legendary)