Galswintha (540–568) was the daughter of Athanagild, Visigothic king of Hispania (the Iberian Peninsula, comprising modern Spain and Portugal), and Goiswintha. Galswintha was the sister of Brunhilda, Queen of Austrasia; and the wife of Chilperic I, the Merovingian king of Neustria. Galswintha and Chilperic were married at Rouen in 567, but soon afterwards she was murdered at the instigation of Chilperic's mistress Fredegund, who then married him.