Sigtrygg's nephew, Ivar Haraldsson, plundered Rathlin Island just off the north coast of Ulaid in 1038 and again in 1045. The latter attack saw Ímar kill Ragnall Ua Eochada, the heir-apparent of Ulaid and brother of Niall mac Eochaid, along with three hundred Ulaid nobles. In retribution Niall again attacked Finn Gall. In 1087, a son of the king of Ulaid, allied with two grandsons Ragnall, attacked the Isle of Man in a failed attempt to oust Godred Crovan, king of Dublin and the Isles.