Guthrum (Alfred the not-so Great)

Guthrum I of Britannia (died 890) was King of Danelaw from 878 to 882, Emperor of Britannia from 882 until his death, High King of Ireland from 885, as well as King of Strathclyde, Alba and the Isles from 882, and King of Gwynedd, Powys, Buellt, Brycheiniog, Glywysing, Gwent, Dyfed, and Prince of Seisyllwg from 880. He also was King of Denmark from 886, King of Italy, Francia, and Roman Emperor from 887.