Anglo-Saxon Chronicle. 679. This year Elwin was slain, by the river Trent, on the spot where Everth (age 34) and Ethelred fought. This year also died St. Etheldritha (age 43); and the monastery of Coldingiham was destroyed by fire from heaven.

Bede. BISHOP THEODORE MADE PEACE BETWEEN THE KINGS EGFRID AND ETHELRED

In the ninth year of the reign of King Egfrid, a great battle was fought between him and Ethelred, king of the Mercians, near the river Trent, and Elfwin, brother to King Egfrid, was slain, a youth about eighteen years of age, and much beloved by both provinces, for King Ethelred had married his sister Osthrid. There was now reason to expect a more bloody war, and more lasting enmity between those kings and their fierce nations; but Theodore, the bishop beloved of God, relying on the Divine assistance, by his wholesome admonitions extinguished the dangerous fire that was breaking out; so that the kings and their people on both sides being appeased, no man was put to death, but only the usual mulct paid to the king for his brother that had been killed; and this peace continued long after between those kings and their kingdoms.