The other half under Halfdan (Ragnar Lodbrog's son ?) had never troubled itself about Wessex, but had taken firm possession in Northumbria.
The practical though short-lived conquest of England begins under Ivar, Ubbe and Halfdan, reputed sons of Ragnar, and is completed by the last of the three in conjunction with the Guthorm above mentioned.
Under two kings named Halfdan and Bacsceg, and six earls, they seized Reading and began to harry Berkshire, Surrey and Hampshire.
Noregs Konunga-tal, now called Fagrskinna, is a Norse compendium of the Kings' Lives from Halfdan the Black to Sverri's accession, probably written for King Haakon, to whom it was read on his death-bed.
It replaces much earlier work, especially the Sciagraphia of Halfdan Einarsson (1777), and the Saga-Bibliotek of.
(850-933), surnamed Haarfager (of the beautiful hair), first king over Norway, succeeded on the death of his father Halfdan the Black in A.D.