1252

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title: "1252" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["1252"] topic_path: "general/1252" source: "https://en.wikipedia.org/wiki/1252" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::callout[type=note] 1252 ::

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

Events

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.
• 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, Prince 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

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