Brunhilda
From BiblePortal Wikipedia
Brunhilda [1]
A masculine queen in the "Nibelungen Lied" who offered to marry the man that could beat her in feats of strength, was deceived by Siegfried into marrying Gunther, and meditated the death of Siegfried, who had married her rival Chriemhilda, which she accomplished by the hand of Hagen. Also a queen of Austrasia, who, about the 7th century, had a lifelong quarrel with Fredegunde, queen of Neustria, the other division of the Frankish world, which at her death she seized possession of for a time, but was overthrown by Clothaire II., Fredegunde's son, and dragged to death at the heels of an infuriated wild horse.