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Jarl Halfdan Ragnarsson is the monarch of the Kingdom of Northhymbre. He starts the game as the lord of Eidynburh.

The character is based on the historical Halfdan Ragnarsson, who, according to Norse sagas, was one of the sons of Ragnar Lodbrok. While Ragnar was legendary, the historicity of Halfdan is generally agreed upon.

Wikipedia Wikipedia has an article on this subject at:
Halfdan Ragnarsson
Kingdom of Northhymbre
Monarch Claimant
Jarl Halfdan Ragnarsson Aetheling Oswine
Vassals
Cyning EgbertJarl Rathbarth RagnarssonEaldorman EaldredJarl Sidroc the ElderEaldorman Ricsige
Ealdorman Egbert the SecondJarl Bjorn RagnarssonHersir Guthred KnutrHersir RognvaldHersir Harald
Hersir Sidroc the YoungHersir FraenaJarl Ivarr Inn BeinlaussiJarl Hubbi RagnarssonKonungr Bagsecg
Ladies
AebbeAlof RagnarsdottirEanflaedFreydisGudrunSigridSigrunnSvanhildTurid