Fredegund (545 - 597 CE), the queen consort of Chilperic I - the Merovingian Frankish king of Soissons, has a reputation of being one of the most bloodthirsty and sadistic women in history. Accounts by Gregory, the Bishop of Tours (539 - 594 CE), depict her as a murderous woman who gained power by means of her husband and applied it to keep his kingdom in a state of war for more than forty years. She was also known as an early exponent of dirty warfare who relied heavily on poison and other covert operations.
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