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King Æthelstan of England secured the submission of four northern rulers: Constantine II of Scotland, Hywel Dda of Deheubarth, Ealdred I of Bamburgh, and Owain ap Dyfnwal of Strathclyde, leading to seven years of peace.
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Æthelstan
King of the English from 927 to 939
Æthelstan or Athelstan was King of the Anglo-Saxons from 924 to 927 and King of the English from 927 to his death in 939. He was the son of King Edward the Elder and his first wife, Ecgwynn. Modern historians regard him as the first King of England and one of the "greatest…Source: Wikipedia (CC BY-SA)
Constantine II of Scotland
King of Alba from 900 to 943
Causantín mac Áeda was an early King of Scotland, known then by the Gaelic name Alba. The Kingdom of Alba, a name which first appears in Constantine's lifetime, was situated in what is now Northern Scotland.Source: Wikipedia (CC BY-SA)
Hywel Dda
King of Gwynedd from 942 to 950
Hywel ap Cadell, commonly known as Hywel Dda, which translates to Howel the Good in English, was a Welsh king who ruled the southern Welsh kingdom of Deheubarth and eventually came to rule most of Wales. He became the sole king of Seisyllwg in 920 and shortly thereafter…Source: Wikipedia (CC BY-SA)
Ealdred I of Bamburgh
9/10th-century ruler of Bernicia
Ealdred was a ruler of Bamburgh, at least part of the former kingdom of Bernicia in northern Northumbria, in the early tenth century. He was the son of Eadwulf.Source: Wikipedia (CC BY-SA)
Owain ap Dyfnwal (fl. 934)
King of Strathclyde
Owain ap Dyfnwal was an early tenth-century King of Strathclyde. He was probably a son of Dyfnwal, King of Strathclyde, who may have been related to previous rulers of the Kingdom of Strathclyde. Originally centred in the valley of the River Clyde, this realm appears to have…Source: Wikipedia (CC BY-SA)