King of Wessex (839–858), son of Egbert and father of Alfred the Great, a pious king who checked the Vikings at Aclea and made a famous pilgrimage to Rome.
Æthelwulf was king of Wessex from 839 to 858, the son of Egbert and the father of four sons who would each become king — among them Alfred the Great. He consolidated the dominant position his father had won for Wessex and, in a mounting Viking storm, won one of the great English victories of the age.
In 851 he defeated a large Danish army at the Battle of Aclea, a rare and decisive check on the Vikings. A notably pious king, he made a year-long pilgrimage to Rome in 855–856, granting a tithe of royal land to the Church and marrying, on his return, a Frankish princess. His absence had bred rebellion at home, which he settled by dividing the kingdom with his son rather than plunging Wessex into civil war.
Æthelwulf was born about 795, the son of Egbert. When his father broke Mercian power and won the south-east of England in 825, Æthelwulf was installed as under-king of Kent and its neighbouring provinces, gaining long experience of rule before he inherited Wessex itself on Egbert's death in 839.
By his first wife, Osburh, he was the father of five sons and a daughter; four of the sons — Æthelbald, Æthelberht, Æthelred, and Alfred — would reign in turn.
Æthelwulf is remembered as a devout, generous, and conciliatory king, more temperate than martial by inclination, though capable of decisive action when the kingdom was threatened. His deep piety shaped his reign: he was open-handed to the Church, granted it a great endowment of land, and undertook the long and dangerous journey to Rome that few kings could contemplate.
That same mildness governed his handling of crisis. Faced on his return from Rome with a son who had seized power in his absence, Æthelwulf chose reconciliation over vengeance, accepting a division of the kingdom rather than risking civil war — a self-effacing wisdom the chroniclers admired. He was a stabiliser rather than a conqueror, whose careful, pious rule preserved and passed on the greatness his father had built, and whose true legacy lay in the remarkable sons he raised.
Æthelwulf's reign coincided with the intensifying Viking assault on England. Danish fleets grew larger and bolder, and in 851 a great army stormed Canterbury and London and put the Mercian king to flight. Æthelwulf met this host at Aclea and, in the words of the Anglo-Saxon Chronicle, made "the greatest slaughter of a heathen host" yet heard of — a victory that gave Wessex a generation's respite.
Secure enough to leave his kingdom, Æthelwulf travelled to Rome in 855 on pilgrimage, taking the young Alfred with him, and granted a tenth of his royal lands to the Church. On the way home he married Judith, daughter of the Frankish king Charles the Bald. In his absence, however, his eldest surviving son Æthelbald had led a conspiracy to seize the throne; Æthelwulf averted war by agreeing to share the kingdom with him.
Æthelwulf died on 13 January 858. By his arrangement the crown passed to his rebellious son Æthelbald in Wessex proper, while another son, Æthelberht, held the south-east — a partition that would soon be reunited as his sons succeeded one another.
Æthelwulf is remembered as the pious king who held Wessex steady through the first great surge of the Viking wars and as the father of the royal brothers who followed him — above all Alfred the Great, whose survival and greatness rested on the strong, well-ordered kingdom Æthelwulf preserved. His victory at Aclea and his careful, unselfish statesmanship in the crisis of 856 mark him as a quietly successful king in a violent age.