The authenticity of the battle as a historical event is subject to question. Contemporary sources say the king was murdered. According to the "Anglo Saxon Chronicle" of 1030, Olaf was killed by his own people. Adam of Bremen wrote in 1070 that Olaf was killed in an ambush, and so did Florence of Worcester in 1100. Those are the only contemporary sources that mention the death of the king. After the king's canonization it was felt that the saint could not have died in such circumstances. The story of the Battle of Stiklestad as most know it gradually developed during the two centuries following the death of King Olaf. Since he was sainted, Olaf must have fallen in a major battle for Christianity.