Blood Feud is a historical novel for children written by Rosemary Sutcliff and published in 1976. It begins in 10th Century England, and tells the tale of an orphaned child of a Celtic father and Saxon mother, who is caught up with the Vikings and ultimately journeys all the way to Constantinople via the Dnieper trading route. The plot is driven by the acceptance of a blood feud commitment, and the struggles of a child born between many cultures to reconcile his beliefs with this commitment. In 1990 it was adapted into an ITV children's drama series called Sea Dragon, produced by Thames Television. Source: Wikipedia (en)