Guthrum
Guthrum (died 890) was a Danish Viking chieftain who led invasions of Anglo-Saxon England and subsequently became the Christian king of East Anglia under the baptismal name Æthelstan.[1]
As a commander in the Great Summer Army from 871, he spearheaded the Danish assault on Wessex in 878, only to suffer decisive defeat at the Battle of Edington against Alfred the Great's forces.[1][2]
Compelled to surrender, Guthrum accepted baptism with Alfred as godfather, formalizing peace through the Treaty of Wedmore, which delineated territorial boundaries and facilitated his withdrawal to East Anglia.[1][3]
Ruling East Anglia from around 880, he issued silver pennies in Anglo-Saxon style to legitimize his authority and stabilize the region, marking a transition from pagan raider to settled monarch.[4][5]