- The first Shepherds' Crusade , a domestic French uprising in response to events in Egypt during the Seventh Crusade , occurs.
- King Alexander III Of Scotland marries Margaret, daughter of King Henry III Of England , precipitating a power struggle between the two monarchs.
- Andrew Of Longumeau , dispatched two years earlier by King Louis IX Of France as an ambassador to the Mongol s, returns to his king with reports from the Mongols and Tartary ; his mission is considered a failure.
- Mindaugas of Lithuania is baptized, in prelude to his crowning as King of Lithuania in 1253 .
- Alexander Nevsky signs the first peace treaty between Kievan Rus' and Norway .
- King Conrad IV Of Germany invades Italy , but fails to subdue the supporters of Pope Innocent IV .
- The German city of Berlin , founded some fifty years earlier, receives its city charter.
- Otakar II Of Bohemia , later to become King of Bohemia , is elected Duke Of Austria .
- The earliest known manuscript of The Proverbs Of Alfred , a collection of sayings of England 's Alfred The Great , is written.
List Of State Leaders In 1251
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