Halfdan was a year old when his father was killed, and his mother Asa
set off immediately with him westwards to Agder, and set herself there
in the kingdom which her father Harald had possessed. Halfdan grew up
there, and soon became stout and strong; and, by reason of his black
hair, was called Halfdan the Black. When he was eighteen years old he
took his kingdom in Agder, and went immediately to Vestfold, where he
divided that kingdom, as before related, with his brother Olaf. The same
autumn he went with an army to Vingulmark against King Gandalf. They had
many battles, and sometimes one, sometimes the other gained the victory;
but at last they agreed that Halfdan should have half of Vingulmark,
as his father Gudrod had had it before. Then King Halfdan proceeded to
Raumarike, and subdued it. King Sigtryg, son of King Eystein, who then
had his residence in Hedemark, and who had subdued Raumarike before,
having heard of this, came out with his army against King Halfdan, and
there was great battle, in which King Halfdan was victorious; and just
as King Sigtryg and his troops were turning about to fly, an arrow
struck him under the left arm, and he fell dead. Halfdan then laid the
whole of Raumarike under his power. King Eystein's second son, King
Sigtryg's brother, was also called Eystein, and was then king in
Hedemark. As soon as Halfdan had returned to Vestfold, King Eystein went
out with his army to Raumarike, and laid the whole country in subjection
to him.