Siward Biornsson (Earl of) Northumberland - Pedigree | FamilyCentral
 Abt 990 - 1045/49
 Abt 967 - 22 Sep 1027
 Abt 936 -
 Abt 965 - 3 Feb 1014
 Abt 970 - Aft 2 Feb 1014
 Abt 959 - 985
 Abt 961 - 18 Sep 1000
 Abt 910 - 1 Nov 986
 Abt 922 - 25 May 992