1284Centuries: 12th century - 13th century - 14th century
- June 26 - According to the Brothers Grimm and older sources, in this date the Pied Piper of Hamelin visits the town of Hamelin, resulting in ca. 130 children being killed. It is not clear what really happened.
- Philip IV of France married Jeanne of Navarre, and becomes King of France.
- Charles II of Naples is captured in a naval battle off Naples.
- The city of Jönköping, Sweden, receives its charter.
- Rudolph I of Germany marries Isabella of Burgundy.
- Kiel becomes a member of the Hanseatic League.
- Hamburg is destroyed by a fire.