| Thornfinn "The Black" Sigurdsson Earl of Orkney |
| Father: Sigurd II "Digri" Hlodversson | Mother: Anleta "Thora Donada" MacKenneth |
| Born: abt 989 of Orkney, Scotland |
Died: abt 1064 Christ's Kirk, Birdsey, Scotland |
| Spouse:
Ingeborg Finnsdatter | Married:
bef 1038 |
| Children: Paul Thornfinnsson Jarl of Orkney and Caithness Erland Thornfinnsson Jarl of Orkney and Cathness | Brothers & Sisters:
Ellen Sigurdsdatter |