question: Who is the mother-in-law of Fredegund?
context: Title: Chilperic I
  Passage: Chilperic I (c. 539 – September 584) was the king of Neustria (or Soissons) from 561 to his death. He was one of the sons of the Frankish king Clotaire I and Queen Aregund.
  Title: Fredegund
  Passage: Fredegund or Fredegunda (Latin: "Fredegundis"; French: "Frédégonde"; died 8 December 597) was the Queen consort of Chilperic I, the Merovingian Frankish king of Soissons. She served as regent during the minority of her son Chlothar II from 584 until 597. Fredegund has traditionally been given a very bad reputation, foremost by the accounts of Gregory of Tours, who depicts her as ruthlessly murderous and sadistically cruel, and she is known for the many cruel stories about her, particularly for her long going feud with queen Brunhilda of Austrasia.
answer: Aregund
citations: Fredegund Chilperic I