When King Magnus had been nine years king of Norway (A.D. 1094- 1102), he equipped himself to go out of the country with a great force. He sailed out into the West sea with the finest men who could be got in Norway. All the powerful men of the country followed him; such as Sigurd Hranason, Vidkun Jonson, Dag Eilifson, Serk of Sogn, Eyvind Olboge, the king's marshal Ulf Hranason, brother of Sigurd, and many other great men.
With all this armament the king sailed west to the Orkney Islands, from whence he took with him Earl Erlend's sons, Magnus and Erling, and then sailed to the southern Hebudes. But as he lay under the Scotch land, Magnus Erlendson ran away in the night from the king's ship, swam to the shore, escaped into the woods, and came at last to the Scotch king's court.
King Magnus sailed to Ireland with his fleet, and plundered there. King Myrkjartan came to his assistance, and they conquered a great part of the country, both Dublin and Dyflinnarskire (Dublin shire).
King Magnus was in winter (A.D. 1102) up in Connaught with King Myrkjartan, but set men to defend the country he had taken. Towards spring both kings went westward with their army all the way to Ulster, where they had many battles, subdued the country, and had conquered the greatest part of Ulster when Myrkjartan returned home to Connaught.