The Chronicle of The Kings of Norway
Part 13 - Death Of Earls Hakon, And Atle Mjove
The following spring (A.D. 869) King Harald went southwards with his fleet along the coast, and subdued Firdafylke. Then he sailed eastward along the land until he came to Vik; but he left Earl Hakon Grjotgardson behind, and set him over the Fjord district.
Earl Hakon sent word to Earl Atle Mjove that he should leave Sogn district, and be earl over Gaular district, as he had been before, alleging that King Harald had given Sogn district to him. Earl Atle sent word that he would keep both Sogn district and Gaular district, until he met King Harald.
The two earls quarreled about this so long, that both gathered troops. They met at Fialar, in Stavanger fiord, and had a great battle, in which Earl Hakon fell, and Earl Atle got a mortal wound, and his men carried him to the island of Atley, where he died.
So says Eyvind Skaldaspiller: —
"He who stood a rooted oak,
Unshaken by the swordsman's stroke,
Amidst the whiz of arrows slain,
Has fallen upon Fjalar's plain.
There, by the ocean's rocky shore,
The waves are stained with the red gore
Of stout Earl Hakon Grjotgard's son,
And of brave warriors many a one."