884 - Peace ended

France
King Carloman the second died in a hunting accident, and vikings started looting in West France, with the death of Carloman the second , the vikings considered that the peace treaty was canceled.
Denmark
According to Beowulf, Snorri Sturluson's Edda and his Ynglinga saga, Saxo Grammaticus' Gesta Danorum, and the Grottasöngr Frode/Frodi became king of Denmark.