Until now, there is evidence for the king Guth-frithin Æthelweard's Chronicle895, and as the kingGuthredwith the term 'Airdeconut' mentionedon the coin from the Silverdale hoard, estimated depo-sition 900-10 AD 17.Factually, it seems to that Guthred filium Hardacnutis a historical person.~~
5The Silverdale hoard with more than 200 pieces silver and jewellery from the date about900-10 AD discovered 2011 in Silverdale, Lancashire located on the edge of MorecambeBay, on the Irish Sea coast.SIGFREDTHEEARLAdam of Bremen reports 18that Guthred fol-lowed Halfdan - and his sons, Olaf, Sigfred ogRagnald were kings of Northumbria. Adam cited- a now lost - Gesta Anglorumcontaining this infor-mation.‘In Angliam quoque miserunt unum ex sociisHalpdani, qui dum ab Anglis occideretur,Dani constituerunt in locum eius Gudredum.Is autem Nordimbriam expugnavit. Scrip-tum est in Gestis Anglorum’ (Praefatio, Ca-pitulum 41).‘They also sent one of Halfdan's companions to Anglia.When he was killed by the Angles, the Danes setGuthred in his place. This conquered Northumbria,which is written in Gesta Anglorum’.‘Anglia, ut supra diximus et in GestisAnglorum scribitur, post mortem Gudredia filiis eius Analaph, Sigtrih et Reginold,per annos fere centum permansit in ditioneDanorum’ (Liber Secundus,Capitulum 22).‘As written in Gesta Anglorum, and after the dead ofGuthred, his sons Olaf, Sigfred and Ragnald reignedAnglia which remained under Danish domination foralmost a hundred years’.Chronicon Æthelweardi 893-(4) mentions a possi-ble Sigfred leading a Norse fleet against NorthDevon, and besieges Exeter with 140 ships, whichimplies that Northumbria was the homeland ofSigfred (Sigeferth piraticus de Northymbriorum uertit adproprias sedes).‘Sigeferth the pirate arrived from the land of the North-umbrians with a large fleet, ravaged twice along the coaston that one expedition, and afterwards sailed back tohis own land’.This decade, the Norsemen had an interactivetrade between the cities of Dublin and York whichat one time stagnated due to internal unrest in thecontrol of Dublin 19. Therefore, Sigfred the Earl(Sichfrit in erll ) was sent to Dublin to bring rest inthe camp.‘Mescbaidh mór for Gallaibh Atho Cliathco n-dechadur i n-esriuth, indala rand dibhla m. nImair, ind rann n-aile la SichfrithnIerll’ (Ulster annals 893.4).‘A great disturbance among the foreigners of Áth Cliath,and they dispersed, one of their divisions went with theson of Ívarr, and the other division with Sigfred theEarl’.This led to, that Sihtric I Ivarsson in Dublin wasdeposed 20and Sigfred Earl Guthredsson took overthe power for a while the following year.
Northumbrian coinage until 910Sigfred was issuing coins bearing his name, thetitle of King, and the mint signature for the cityof York (Ebraice Civitas). He is spelled on the coinsas both the Latinised Siefredus (c. 894-98) and theAnglicised Sievert (c. 895-902).