It was Sigeric who advised King Æthelred (the Unready) to pay a tribute to the invading Danish king Sweyn Forkbeard in 991. Æthelred presented Sweyn with 10,000 pounds of silver, in response to which Sweyn temporarily ceased his destructive advance into England, though he later returned for further tribute. Sweyn's ever-increasing demands in the following years resulted in a debilitating tax later known as the Danegeld, payable by the inhabitants of Æthelred's territories.
In 994, Sigeric paid tribute to the Danes to protect Canterbury Cathedral from being burned. In the same year, a diploma granting rights to the diocese of Cornwall and Bishop Ealdred of Cornwall stated that it was written by Sigeric, but it is unlikely that the document was actually written by the archbishop.
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge: Cambridge University Press. ISBN0-521-56350-X.
Hindley, Geoffrey (2006). A Brief History of the Anglo-Saxons: The Beginnings of the English Nation. New York: Carroll & Graf Publishers. ISBN978-0-7867-1738-5.
Knowles, David (1976). The Monastic Order in England: A History of its Development from the Times of St. Dunstan to the Fourth Lateran Council, 940–1216 (Second reprint ed.). Cambridge, UK: Cambridge University Press. ISBN0-521-05479-6.
Ortenberg, Veronica (1999) . "The Anglo-Saxon Church and the Papacy". In Lawrence, C. H. (ed.). The English Church and the Papacy in the Middle Ages (Reprint ed.). Stroud, UK: Sutton Publishing. pp. 29–62. ISBN0-7509-1947-7.