1211

Events

* The oldest extant double-entry bookkeeping system record dates from this year.
* September 14 - Canons regular of the Order of the Holy Cross are founded.
* Troops led by Estonian resistance fighter Lembitu of Lehola destroy a garrison of missionaries in the historical Estonian region of Sakala, and raid the Russian town of Pskov.
* Mongol forces under Genghis Khan invade Jin China, aiming at this stage simply to loot the countryside. A Chinese army is defeated and slaughtered at the Battle of the Badger's Mount near Zhangjiakou and another is beaten at Mukden, where the city is taken. Beijing is also besieged by the Mongol hordes.
* The church in the French city of Reims burns down; soon after, construction begins on the Notre Dame de Reims Cathedral.

Births

* Ibn Khallikan, Muslim scholar

Deaths

* August 9 - William de Braose, 4th Lord of Bramber

Heads of State

* France - Philippe II, Auguste King of France (reigned from 1180 to 1223)
* Mongol Empire - Genghis Khan, Mongol Khan (from 1206 to 1227)
* Venice - Pietro Ziani Doge of Venice (ruled from 1205 to 1229)