 The king of one country threatened by the beast 's arrival was advised to offer it a weekly sacrifice of seven virgins . In desperation the king eventually issued a proclamation offering his kingdom , his daughter 's hand in marriage and a magic sword to anyone who could destroy the monster . Assipattle , the youngest son of a local farmer , defeated the creature ; as it died its teeth fell out to become the islands of Orkney , Shetland and the Faroes , and its body became Iceland . 
