What Happened in 1277
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- Mar 7 Condemnation of 219 philosophical and theological theses by Stephen Tempier, Bishop of Paris
- May 13 As Vizier Mehmet I of Karaman issues a firman (decree) ordering only the Turkish language to be used, not Arabic or Persian
- Nov 25 Giovanni Gaetano Orsini elected as Pope Nicolas III
- May 1 Stefanus IV Uros I de Great, King of Serbia (1243-76), dies
- May 20 John XXI [Petrus Juliani/Hispanus], Portuguese Pope (1276-77), dies. (b. 1215)
- Jul 1 Baibars, Mameluk sultan of Egypt (b. 1223)