Note 16 — Chapter I · THE VIKINGS IN IRELAND (795-1014).
Reading edition
It is extremely difficult to identify these two princes owing to the similarity between their names. It has been suggested that Sighfrith is the Siefredus or Sievert who ruled jointly with Guthred-Cnut (d. c. 894) as King of Northumbria, while Sitriucc son of Ivarr is probably the “Sitric comes” whose name appears on a coin dating from this period. (See A. Mawer: The Scandinavian Kingdom of Northumbria, pp. 11-13. Saga-book of the Viking Club, VII. Part I.)