| Thornfinn I Rollo (Brico) "Hausakliffer" Einarsson |
| Father: Einar "Turf" Rognvaldsson Earl of Orkney | Mother: Mrs Einar "Turf" Rognvaldsson Countess of Orkney |
| Born: abt 890 of Orkney Islands, Scotland |
Died: aft 977 |
| Spouse:
Grelod (Gellaf) (Grelauca) Duncansdatter | Married:
abt 914 of Orkney Islands, Scotland |
| Children:
Arnfinn Thornfinnsson Earl of Orkney Havard "Season-Prosperous" Thornfinnsson Earl of Orkney and Caithness Ljot (Liot) Thornfinnsson Earl of Orkney Skuli Thornfinnsson Earl of Caithness Hlodver (Lodver) Thornfinnsson Earl of Orkney Miss Thornfinnsdatter Miss Thornfinnsdatter Ansfred Thornfinnsson | Brothers & Sisters:
Arnkell I Einarsson Earl of Orkney Erland I Einarsson Earl of Orkney |