 The Chronicle of Mann states that Rögnvaldr gave Óláfr possession of Lewis , which is described as an island ; Lewis is in fact the northern part of the island of Lewis and Harris , which is by far the largest island in Scotland . The northern part of the island is rather flat and boggy , while the southern part , Harris , is more mountainous . The chronicle seems , however , to have conflated the northern and southern parts as it describes Óláfr 's island as being mountainous and rocky , completely unsuitable for cultivation , and declares that the island 's small population lived mostly by hunting and fishing . The chronicle relates that Óláfr was unable to support himself and his followers , because of his poor land , and states that he led " a sorry life " . 
