II. THE CONQUEST OF ENGLAND 1003-1013

DURING the five years of rivalry between Olaf and Sweyn (995–1000), England had enjoyed comparative peace. Incursions, indeed, began again in 997; but these were clearly of the earlier type, not invasions like the movements led by Olaf and Sweyn. Who the leaders were at this time we do not know; but the Northern kings were in those years giving and taking in marriage and busily plotting each other’s destruction, so we conclude that the undertakings continued to be of the private sort, led, perhaps, by Norse chiefs who had found life in Norway uncongenial after King Olaf had begun to persecute the heathen worshippers.

The English had now come to realise the importance of the upper Irish Sea as a rendezvous for all forms of piratical bands; and the need of aggressive warfare at this point was