During his invasion of Scotland, Siward, Earl of Northumbria, defeated Macbeth, King of Scotland, in an engagement north of the Firth of Forth. Siward, Earl of Northumbria: Siward or Sigurd was an important earl of 11th-century northern England. The Old Norse nickname Digri and its Latin translation Grossus are given to him by near-contemporary texts. He emerged as a regional strongman in England during the reign of Cnut. Cnut was a Scandinavian ruler who conquered most of England in the 1010s, and Siward was one of many Scandinavians who came to England in the aftermath, rising to become sub-ruler of most of northern England. From 1033 at the latest, he was in control of southern Northumbria, present-day Yorkshire, governing as earl on Cnut's behalf. July 27, 1054. Wiki link