Historical
1228-1229: Israel - Frederick II leads the Sixth Crusade (of nine) and gains control of Jerusalem through diplomatic means by signing a treaty with Malik al-Kamil, nephew of Saladin which gives Bethlehem, Jerusalem, Nazareth and a corridor to the port of Acre to Frederick who has himself crowned King of Jerusalem at the Church of the Holy Sepulchre on March 18
1228: Mongolia, Russia - Mongols defeat Russian princes, but this being a reconnaisance mission, the victory is not consolidated
1229: Iran - Great Genghis Khan dies, his empire Included much of the Persian Empire and the Steppes of Russia, he is succeeded by his third son, Ogadai "the Great Khan" who subdued the Chin dynasty in northern China and ravaged much of eastern Europe
1229: Israel - Christians retake Jerusalem and hold onto It for ten years
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