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Landnámabók (also called Landnáma), the Book of the Settlement: a unique Icelandic genealogical record, probably originally compiled in the early 12th century by Ari Thorgilsson the Learned, although it exists in several later versions. It lists the names of 400 original settlers of Iceland, their Norwegian origins, their descendants, and describes their landholdings with great topographical accuracy. Occasionally, anecdotes of marriages or feuds, or character sketches, are interspersed with the lists of names. The Landnámabók served as the source for many Icelandic sagas.