The Norwegian Account of Haco's Expedition against Scotland; A.D. MCCLXIII

From the Preface
...The Alexanders of Scotland having united Galloway, then a powerful maritime state, to their dominions, began to think of measures for obtaining a permanent possession of the Hebrides by expelling the Norwegians. The preparatory steps they took were first to secure the Somerled family, and next to gain over the insular chieftains. Haco was no less earnest to attach every person of consequence to his party. He gave his daughter in marriage to Harold King of Man; and, on different occasions, entertained at his court King John, Gilchrist, Dugall the son of Rudri, Magnus Earl of Orkney, Simon bishop of the Sudoreys, and the abbot of Icolmkil.

All this, however, did not effectually conciliate the Somerlidian tribe. The Norwegian Monarch, disappointed in his negotiations, had recourse to the sword, and sailed with a fleet, which both the Sturlunga-saga, and the Flateyan annals represent as the most formidable that ever left the ports of Norway...