Siward Biornsson, Earl of Northumberland - Pedigree | FamilyCentral
 Abt 993 - 29 Sep 1027
 Abt 971 -
 Abt 960 - 2 Feb 1014
 Abt 947 - 18 Sep 1000
 Abt 910 - 1 Nov 987
 Abt 922 - 25 May 992