About 1008, Olaf the Holy, later king of Norway, landed on Saaremaa. The Oesilians, taken by surprise, had at first agreed to pay the demands made by Olaf, but then gathered an army during the negotiations and attacked the Norwegians. Olaf (who would have been only 13 years old) claimed to have won the battle. Olaf was the subject of several biographies, both hagiographies and sagas, in the Middle Ages, and many of the historical facts concerning his adventures are disputed.