http://en.wikipedia.org/wiki/Ælfgifu_of_York

Ælgifu , also known as Elgiva or Elffleda, was the daughter of Thored of Northumbria, Ealdorman of York and Hilda. She married Ethelred the Unready, King of England, son of Eadgar 'the Peaceful', King of England and Ælfthryth, between 980 and 985. They had at least eight children:
▪ Æthelstan Ætheling
▪ Edmund Ironside
▪ Ecgberht Ætheling
▪ Eadred Ætheling
▪ Eadwig Ætheling
▪ Eadgar Ætheling the Elder.
▪ Edith, who married Eadric Streona, ealdorman of Mercia
▪ Ælfgifu, who married Uchtred the Bold, ealdorman of Bamburgh
▪ a daughter Wulfhild, who married Ulfcytel Snillingr
▪ a daughter Aethelreda, who married Gospatric.