Galswintha

Galswintha, also written Galswinthe, (c. 540 – 568) was a queen consort of Neustria (a western part of Francia, now a large part of the north of modern France). She was the daughter of Athanagild, theVisigothic king of Hispania (the Iberian Peninsula, comprising modern Spain and Portugal), and Goiswintha. Galswintha was the sister of Brunhilda—queen consort of Austrasia—and the wife of Chilperic I, the Merovingian king of Neustria. Galswintha was probably murdered at the urging of Chilperic's former concubine Fredegund (and then later wife), instigating a 40-year civil war within the Merovingian kingdom.

Source: Wikipedia — https://en.wikipedia.org/wiki/Galswintha