1251 CE
The first Shepherds' Crusade, a domestic French uprising in response to events in Egypt during the Seventh Crusade, occurs. Möngke Khan is elected as the fourth great Khan of the Mongol Empire. King Alexander III of Scotland marries Margaret, daughter of King Henry III of England, precipitating a power struggle between the two monarchs.
Geopolitics & Diplomacy
Conflict & Security
- April – The first Shepherds' Crusade, a domestic French uprising in response to events in Egypt during the Seventh Crusade, occurs.source
- May – English governor Simon de Montfort suppresses a revolt in Gascony.source
- Andrew de Longjumeau, dispatched two years earlier by King Louis IX of France as an ambassador to the Mongols, meets the king in Palestine, with reports from the Mongols and Tartary; his mission is considered a failure.source
- King Conrad IV of Germany invades Italy, but fails to subdue the supporters of Pope Innocent IV.source
Religion & Belief
Culture & Society
- April 21 – City of Launggyet in Arakan (modern-day Burma) is founded according to some sources.source
- December 26 – King Alexander III of Scotland marries Margaret, daughter of King Henry III of England, precipitating a power struggle between the two monarchs.source
- The carving of the Tripitaka Koreana, a collection of Buddhist scriptures recorded on some 81,000 wooden blocks, is completed.source
Births
Deaths
- January – Bohemund V of Antiochsource
- February 9 – Matthias II, Duke of Lorrainesource
- March 6 – Rose of Viterbo, Italian saint (b. 1235)source
- March 31 – William of Modena, Bishop of Modenasource
- June 6 – William III of Dampierre, Count of Flanderssource
- Winter 1251–52 – Eljigidei, Mongol commander of Persia, killedsource
- Oghul Qaimish, 3rd regent of the Mongol Empire, following her husband's deathsource
- Isobel of Huntingdon, Scots noblewoman (b. 1199)source