As Archbishop of York, Wulfstan's administrative duties were considerable. In addition to tending the spiritual and financial needs of the religious and secular communities of the North of England, he was deeply involved in the vital politics of the South. He was one of the most important members of king Æthelred II's advisory council, known as the Witan, and as such was active in all the most significant political decisions of the day. By 1008 he had secured the privilege of drafting the official royal legislation promulgated by the king and the Witan. He was deeply concerned with legislation, holding that good laws were essential if a people were to prosper. He continued as the king's chief legal draftsman on into the reign of the Danish king Cnut the Great. It is both remarkable and puzzling that Wulfstan was able to play so central a role in politics under both Æthelred's and Cnut's reigns, especially as it was under Æthelred's reign that Wulfstan, in his "Sermo Lupi", so vehemently decried the depredations of the Danish and Norwegian Vikings.