The vigour of Gregory king of Scotland having been found, notwithstanding his prowess and the success of his arms, inadequate to support an authority which had been usurped by him as regent during the minority of Eocha, after holding the reins of government in Scotland and Strathclyde during eleven years, was expelled, together with Eocha, by Donal, son of the late King Constantine II., A. D. 893. To Donal, who was slain by the Danes, A. D. 904, succeeded his cousin Constantine III., the son of Aodh, who had been slain by Gregory. Another Donal, brother to Constantine III., had been "elected" king of the Strathclyde Britons four years before the elevation of that monarch to the throne of Scotland. During the life of this Donal, the districts of Carlisle and Galloway were not united to Strathclyde, but remained attached to Scotland; from which, however, they were separated after his decease, and given to his son and successor, Eugenius. To the new kingdom, thus founded by Constantine in favour of his nephew and presumptive heir, by the union of Carlisle and Galloway with Strathclyde, was given the name of Cumbria, derived from the common appellation of its inhabitants. Its extent is precisely defined in a return made by the prior and convent of Carlisle to a writ of Edward the First, requiring them, as well as other religious houses, to furnish, from chronicles or other documents in their possession, any information bearing upon the alleged right of supremacy over Scotland vested in the English crown. The return sets forth, "That district was called Cumbria, which is now included in the bishoprics of Carlisle, Glasgow, and Whitherne, together with the country lying between Carlisle and the river Duddon:" in other words, the entire tract from the Clyde to the confines of Lancashire. In the "Inquisitio Davidis," which does indeed extend to all parts of Cumbria which remained in David's possession, we are expressly told that "he had not then within his dominion the whole Cumbrian region," the present county of Cumberland, or, as it was then called, Earldom of Carlisle, having been severed from it soon after the Norman Conquest. Although Fordun is the only author who narrates the cession of Carlisle and Galloway to Gregory, and the subsequent grant of these districts to Eugenius, whereby they were united to Strathclyde, and the whole merged into a single government, we have abundant evidence of the existence of Cumbria and the intimate union of Constantine and Eugenius at this period. In the year 938, these princes, in conjunction with the Danes and Welsh, attempted to wrest the sovereign power out of the vigorous hands of Athelstane. The combined forces were signally defeated by the Anglo-Saxon monarch at Brunanburgh (supposed by some to be Bromborough, near Chester);