 It was thus that Siward became earl of all Northumbria, perhaps the first person to do so since Uhtred the Bold.Ealdred's daughter Ealdgyth was married to Ligulf, who was murdered in 1080.Ealdred's daughter, Aelfflaed, was the second wife of Siward and her son (Ealdred's grandson) was Waltheof, Earl of Northumbria.