Both the Saga of Ólafr Tryggvason and Flateyjarbók claim that Grímr Kamban was the first man to discover the Faroe Islands. The two sources disagree, however, on the year in which he left and the circumstances of his departure. Flateyjarbók details the emigration of Grímr Kamban as sometime during the reign of Harald Hårfagre, between 872 and 930 AD. The Saga of Óláfr Tryggvason indicates that Kamban was residing in the Faroes long before the rule of Harald Hårfagre, and that other Norse were driven to the Faroe Islands due to his chaotic rule. This mass migration to the Faroe Islands shows a prior knowledge of the Viking settlements' locations, furthering the claim of Grímr Kamban's settlement much earlier. While Kamban is recognized as the first Viking settler of the Faroe Islands, his surname is of Gaelic origin. Writings from the Papar, an order of Irish monks, show that they left the Faroe Islands due to ongoing Viking raids.