1262

- King Mindaugas of Lithuania renounces Christianity, returning to his pagan roots and reverting to Grand Duke of Lithuania.

- The Icelandic Commonwealth enters into a treaty establishing a union with Norway and acknowledges Norwegian King Haakon IV as its ruler.

- Strasbourg becomes an Imperial Free City of the Holy Roman Empire.

- King Henry III of England obtains a papal bull releasing him from the Provisions of Oxford, preceding the Second Barons' War, a civil war started in 1263.