Gunhild's sons embraced Christianity in England, as told before; but when they came to rule over Norway they made no progress in spreading Christianity — only they pulled down the temples of the idols, and cast away the sacrifices where they had it in their power, and raised great animosity by doing so.
The good crops of the country were soon wasted in their days, because there were many kings, and each had his court about him. They had therefore great expenses, and were very greedy. Besides, they only observed those laws of King Hakon which suited themselves. They were, however, all of them remarkably handsome men — stout, strong, and expert in all exercises.
So says Glum Geirason, in the verses he composed about Harald, Gunhild's son: —
"The foeman's terror, Harald bold,
Had gained enough of yellow gold;
Had Heimdal's teeth  enough in store,
And understood twelve arts or more."
The brothers sometimes went out on expeditions together, and sometimes each on his own account. They were fierce, but brave and active; and great warriors, and very successful.
Footnotes and references:
Heimdal was one of the gods, whose horse was called Gold- top; and the horse's teeth were of gold.