Ubba was a prominent figure in the 9th century, known for his role as one of the commanders of the Great Heathen Army, which launched a series of invasions into Anglo-Saxon England during the 860s. This formidable coalition of Viking warbands drew its forces from various regions, including Scandinavia, Ireland, and even Frisia, where Ubba is believed to have held a position of influence.
In the year 865, the Great Army, under the leadership of Ivar the Boneless, made its winter encampment in East Anglia. This strategic move preceded their assault on Northumbria, which resulted in significant devastation. By 869, after being temporarily appeased by the Mercians, the Vikings turned their attention to the East Angles, culminating in the death of their king, Edmund, who would later be venerated as a saint.
While contemporary accounts do not directly link Ubba to the campaign against the East Angles, later sources have associated him with the legendary martyrdom of King Edmund. Over time, both Ubba and Ivar became emblematic of the Viking invaders, often depicted as adversaries of Christianity in various hagiographical narratives. Their connection to the legendary figure of Ragnar Lodbrok further complicates their historical portrayal, as the origins of this legend may have been influenced by the Viking settlement patterns in England.
Following the fall of East Anglia, the leadership of the Great Army transitioned to figures like Bagsecg and Halfdan, who continued their campaigns against the Mercians and West Saxons. By 873, the army had divided, with Halfdan settling in Northumbria while other factions, including one potentially led by Ubba, ventured southward. This division of forces led to significant military engagements, including a notable attack on Wessex in the winter of 877–878.