Algar was soon after expelled his government by the intrigues and power of Harold; but being protected by Griffith, prince of Wales, who had married his daughter, as well as by the power of his father Leofric, he obliged Harold to submit to an accommodation, and was reinstated in the government of East Anglia. This peace was not of long duration: Harold, taking advantage of Leofric’s death, which happened soon after, expelled Algar anew, and banished him the kingdom: and though that nobleman made a fresh irruption into East Anglia with an army of Norwegians, and overran the country, his death soon freed Harold from the pretensions of so dangerous a rival. Edward, the eldest son of Algar, was indeed advanced to the government of Mercia; but the balance which the king desired to establish between those potent families, was wholly lost, and the influence of Harold greatly preponderated. {1055.} The death of Siward, duke of Northumberland, made the way still more open to the ambition of that nobleman. Siward, besides his other merits, had acquired honor to England by his successful conduct in the only foreign enterprise undertaken during the reign of Edward. Duncan, king of Scotland, was a prince of a gentle disposition, but possessed not the genius requisite for governing a country so turbulent, and so much infested by the intrigues and animosities of the great. Macbeth, a powerful nobleman, and nearly allied to the crown, not content with curbing the king’s authority, carried still farther his pestilent ambition: he put his sovereign to death; chased Malcolm Kenmore, his son and heir, into England, and usurped the crown. Siward, whose daughter was married to Duncan, embraced, by Edward’s orders, the protection of this distressed family: he marched an army into Scotland; and having defeated and killed Macbeth in battle, he restored Malcolm to the throne of his ancestors.[*] [* W. Malms, p. 79. Hoveden, p. 443. Chron. Mailr. p. 158 Buchanan, p, 115, edit. 1715]. This service, added to his former connections with the royal family of Scotland, brought a great accession to the authority of Siward in the north; but as he had lost his eldest son, Osberne, in the action with Macbeth, it proved in the issue fatal to his family. His second son, Walthoef, appeared, on his father’s death, too young to be intrusted with the government of Northumberland; and Harold’s influence obtained that dukedom for his own brother Tosti.