Saxo Grammaticus relays an account of how Ragnar Lodbrok went to war w/the King of Sweden. During the battle, a woman named Lagertha distinguished herself; "a skilled Amazon, who, though a maiden, had the courage of a man, & fought in front among the bravest with her hair loose over her shoulders. All marveled at her matchless deeds..." Ragnar was so impressed w/her that he married her, & she continued to fight in his battles thereafter.
Lagertha (History channel VIKINGS) - Lagertha was, according to legend, a Viking shieldmaiden from what is now Norway, and the onetime wife of the famous Viking Ragnar Lothbrok. http://www.englisc-gateway.com/bbs/topic/40632-the-real-lagertha/