Norse occupied fertile parts, [1];
ancient monuments, [2];
writing, [2];
Orkneyinga Saga only record before 12th cent., [3];
earlier notices and later records, [3];
earldom claimed by Sigurd Hlodverson, [26];
Skuli Thorfinnson cr. earl, [25];
C. people in Iceland, [27], [28];
sea battle between Ulf and Helgi, [28];