- Damietta is besieged by the knights of the Fifth Crusade.
- Livonian Brothers of the Sword begin to conquer Estonia.
- Minamoto no Sanetomo becomes Udaijin of Japan.
- Alfonso IX of Castile founds a university in Salamanca.
- Emperor Chukyo of Japan
- Kujo Yoritsune, fourth shogun of the Kamakura shogunate
- May 1 - Rudolph I of Germany