Year 1252 (MCCLII) was a leap year starting on Monday of the Julian calendar.

Events

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By place

Europe

• 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 León.

• 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 Klaipėda (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.

Asia

• The classic Japanese text Jikkunsho is completed.

• The Chinese era Chunyou ends (→ 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.

Births

• March 25 Conradin, Duke of Swabia (d. 1268)

• Safi-ad-din Ardabili, Persian Sufi leader

• Eleanor de Montfort, Princess of Wales, English-born consort (d. 1282)

Deaths

• January 1 Saint Zdislava Berka, Bohemian lay Dominican benefactress

• January 23 Isabella, Queen of Armenia

• January Bohemond V of Antioch

• February 3 Sviatoslav III of Vladimir, Prince of Novgorod (b. 1196)

• April 1 Kujō Michiie, Japanese regent

• April 6 Saint Peter of Verona

• May 3 or May 4 Günther von Wüllersleben, Grand Master of the Teutonic Knights

• May 30 King Ferdinand III of Castile and Leon

• June 6 Robert Passelewe, Bishop of Chichester

• June 9 Otto I, Duke of Brunswick-Lüneburg

• June 29 Abel, King of Denmark (b. 1218)

• August 1 Giovanni da Pian del Carpine, Italian chronicler of the Mongol Empire

• November 27 Blanche of Castile, queen of Louis VIII of France and regent of France (b. 1188)

date unknown

• John of Basingstoke, English scholar and ecclesiastic

• Henry I, Count of Anhalt

• Sorghaghtani Beki, Mongolian empress and regent

• Catherine Sunesdotter, Swedish queen consort

• Yesü Möngke, Khan of the Chagatai Khanate

References