
| Name | Siward "the Dane" (Earl of Northumbria) BIORNSSON | |
| Born | 1020 | Denmark |
| Gender | Male | |
| Died | 5 May 1055 | York, Yorkshire, , England |
| Person ID | I6096 | Rofheart-Jones Ancestry.com Current Tree |
| Last Modified | 3 Oct 2019 | |
| Father | Ulf 'Wolf' Jarl of Skane THORGILSSON, EARL OF DENMARK, b. 967, Hålland, Jamtland, Sweden | |
| Relationship | natural | |
| Mother | Estrid Margaretha SVENSDOTTER, b. 997, Roskilde, Roskilde, Denmark | |
| Relationship | natural | |
| Married | 1015 | Denmark |
| Family ID | F1474 | Group Sheet | Family Chart |