As no allusion is made to Constantine in connection with the second expedition of the Olaves, it must remain a matter of conjecture whether any assistance on his part contributed to its successful issue; though the previous career of the Scottish king, as well as his conduct on a subsequent occasion, might almost warrant such a supposition. The remembrance of Brunanburgh, however, may possibly have deterred him from such a step, and by this time age and its accompanying infirmities must have begun to weigh heavily upon the venerable monarch; for nearly seventy years had now elapsed since the death of his father Aodh. It was an era in which the sword in a vigorous hand was necessary for the defence of the crown; and Constantine may have been actuated by prudent motives when he resigned the sceptre before it slipped from his grasp, and retiring to the seclusion of the monastery of St. Andrews, [Sidenote: A. D. 943.] relinquished the cares and duties of his kingdom to assume the office of abbot.[78] Throughout a reign extending over forty years and upwards, Constantine wielded his authority with vigour, if not always with success, and even in his declining years maintained the reputation of a valiant and experienced warrior. The most important event in his career, and that which exercised the greatest influence over the future prospects of his kingdom, was the establishment of a branch of his own family over the British principality of Strath Clyde, as it unquestionably tended to the gradual amalgamation of the inhabitants of that district with their more numerous and powerful Scottish neighbours, and prepared the way for the permanent annexation of the province during the reign of Malcolm II. In his efforts to assist another member of his family in obtaining a footing in Danish Northumbria he was not equally successful; but though his connection with Olave Sitricson embroiled him with the warlike Athelstan, it relieved his kingdom from the incursions of the Northmen, for with the exception of the contests which arose in later times between the Jarls of Orkney (a different race from the Hy Ivar), and the lords of the northern provinces--a rivalry which incidentally tended to strengthen the authority of the Scottish kings at the expense of their too powerful dependants--no further allusion is made to the attacks of the Scandinavians beyond an occasional and isolated inroad upon the eastern coasts of Scotland. The contemporary of four of the Anglo-Saxon kings, Constantine, during the course of his lengthened and chequered reign, was a witness of momentous changes; the enemies of his youth and manhood became the firm allies of his later years, and the neighbouring monarchy, which had been rescued from ruin by the genius of the great Alfred, strengthened by the steady policy of Edward and his talented sister, and raised to an unexampled pitch of glory by the energy and valour of the indomitable Athelstan, threatened, before the close of his eventful