In addition to the traditional territory of East Anglia, Cambridgeshire and parts of Bedfordshire and Hertfordshire, Guthrum's kingdom probably included Essex, the only portion of Wessex which had come under Danish control.
Lisaks tavalisele East Anglia territooriumile, Cambridgeshire'le ning Bedfordshire'i ja Hertfordshire'i osadele, hõlmas Guthrumi kuningriik arvatavasti Essexi, ainsa Wessexi osa, mis läks Taani kontrolli alla.