Kingdom of Strathclyde
The relocation is partly exemplified by a shift in royal terminology. Until the fall of Alt Clut, for example, the rulers of the realm were styled after the fortress; whereas following the loss of this site, the Kingdom of Alt Clut came to be known as the Kingdom of Strathclyde in consequence of its reorientation towards Ystrat Clut (Strathclyde), the valley of the River Clyde. Arthgal himself is styled King of the Strathclyde Britons upon his death in 872—the first use of this terminology by Irish sources. Although it is possible that Arthgal ultimately met his end in Ireland at the hands of his Viking captors, this title could instead be evidence that he had briefly ruled the new Kingdom of Strathclyde. Either he or Rhun could have been the first monarch to rule this reconstructed realm.