 Ecgfrith 's two marriages — the first to the saintly virgin Æthelthryth ( Saint Audrey ) , the second to Eormenburh — produced no children . He had two full brothers : Alhfrith , who is not mentioned after 664 , and Ælfwine , who was killed at the battle on the Trent in 679 . Hence the succession in Northumbria was unclear for some years before Ecgfrith 's death . Bede 's Life of Cuthbert recounts a conversation between Cuthbert and Abbess Ælfflæd of Whitby , daughter of Oswiu , in which Cuthbert foresaw Ecgfrith 's death . When Ælfflæd asked about his successor , she was told she would love him as a brother : 
