Siward Biornsson - Pedigree | FamilyCentral
 Abt 1020 - 1055
Family Group
 Abt 993 - 5 Oct 1027
 Abt 971 -
 Abt 960 - 8 Feb 1014
 Abt 970 - Aft 8 Feb 1014
 Abt 947 - 24 Sep 1000
 Abt 910 - 6 Nov 987
 Abt 920 - 25 May 992
  Children
    1.
Sybil of Northumberland
    2.
Osbeorn ... Northumberland
    3.
Living