Florence of Worcester

Florence, or John, of Worcester wrote this Chronicle around 1118:

Anlaf, the Pagan king of Ireland and many other isles, at the instigation of his father-in-law Constantine, king of the Scots, entered the mouth of the Humber with a powerful fleet. King Athelstan, and his brother Edmund the etheling, encountered him at the head of their army at a place called Brunanburh, and the battle, in which five tributary kings and seven earls were slain, having lasted from daybreak until evening, and been more sanguinary than any that was ever fought before in England, the conquerors retired in triumph, having driven the kings Anlaf and Constantine to their ships; who, overwhelmed with sorrow at the destruction of their army, returned to their own countries with very few followers.