Historical
1231: Mongolia, Korea - Mongols Invade Korea
1231: Sicliy - Frederick I Issues The Golden Bull of Sicily, It is a complete reorganization of Sicily Including a code of laws
1232: China - Chinese use rockets in battle for the first time, demonstrating the military use of gunpowder, thus, Its use quickly spreads to many other countries
1232: England - King of England Issues the Royal Charter for Coal Fields for the development of the coal fields in New Castle, coal quickly becomes a source of energy
1236: Mongolia, Russia - Mongols return to Russian, and in four year period subjugate the country
1236: Spain - Ferdinand III captured Cordoba from the Moors in Spain leaving only Granada in Moorish hands
1240: Mongolia, Russia - Mongol leader Batu Khan (son of Juchi, oldest son of Genghis Khan) razes Kiev, curtailing growth of Kievan Russia, and permitting Muscovite Russia to emerge as dominant force in Russian life
1240: Russia, Sweden - Alexander Nevsky, a Russian prince, repels the Swedes near St. Petersburg after Pope Gregory IX asked the Swedes to punish the Orthodox Russians for helping the Finns avoid conversion to Latin Catholicism
1241: Mongolia, Hungary - Mongols defeat Bela IV at Muhi, and occupy Hungary for a year
1243: Israel - Christians retake Jerusalem for one year
1244: Egypt, Israel - Muslim mercenaries under the direction of the Egyptian pasha Khwarzmi capture Jerusalem which starts the Sixth Crusade, Egypt controls Jerusalem until 1517 and It remained in Muslim hands until 1918
1248-1254: Egypt - Seventh Crusade (of nine), a failure, and Louis IX of France spent much of the crusade living at the court of the crusader kingdom in Acre, in the midst of this crusade was the first Shepherds Crusade in 1251
1250: Egypt - Battle of Fairskur, Egyptian forces led by the new Caliph, Turanshah, defeat the troops of the Seventh Crusade and capture Louis IX