1252

Events

April 6 – Saint Peter of Verona is assassinated by Carino of Balsamo.
May 15 – Pope Innocent IV issues the papal bull Ad exstirpanda, which authorizes the torture of heretics in the Medieval Inquisition. Torture quickly gains widespread usage across Catholic Europe.
June 1 – Alfonso X is proclaimed king of Castile and LeÃÂ³n.
July – The settlement of Stockholm in Sweden is founded, by Birger Jarl.
December 25 – Christopher I of Denmark is crowned King of Denmark, in the Lund Cathedral.
The Polish land of Lebus is incorporated into the German state of Brandenburg, marking the start of Brandenburg's expansion into previously Polish areas (Neumark).
The Lithuanian city of KlaipÃÂda (Memel) is founded by the Teutonic Knights.
The town and monastery of Orval Abbey in Belgium burn to the ground; rebuilding takes 100 years.
Thomas Aquinas travels to the University of Paris, to begin his studies there for a master's degree.
In astronomy, work begins on the recording of the Alfonsine tables.

The classic Japanese text Jikkunsho is completed.
The Chinese era Chunyou ends (Ã¢ÂÂ Emperor Lizong).
Mongol conquest of the Song dynasty: the Mongols take the westernmost province of the Song dynasty empire.</onlyinclude>
New Mongol invasion of Tibet.