King Magnus had three battles with Svein Ulfson. So says Thiodolf:--

"To our brave Throndhjem sovereign's praise

The skald may all his skaldcraft raise;

For fortune, and for daring deed,

His song will not the truth exceed.

After three battles to regain

What was his own, unjustly ta'en,

Unjustly kept, and dues denied,

He levied dues in red-blood dyed."

Heimskringla; Or, The Chronicle of the Kings of Norway · 第 629 / 1013 题