More Separation of Church and State
King Edward I of England issues the writ of Circumspecte Agatis that sets limits of jurisdiction between the Church's religious court and the King's common court. Until this time, questions of jurisdiction were tricky but this is not judicial reform. It's locking in what the Church and State have been doing informally for some time.
These are the years of English jurisprudence from which America will draw it's baseline legal precepts. It may not seem like much, but America's founding will depend on little things like this.  
Say Bye-Bye to Charles and His Puppet Pope
King Charles I of Sicily (and Naples) was having a bad day when the Sicilians rebelled and ousted him in favor of King Peter of Aragonoth. Later the Argonese fleet captured King Charles's son and held him hostage. But, while preparing for another invasion of Sicily, King Charles fell ill and died. The people of Byzantium and Sicily cheered.
Pope Martin IV, the puppet Pope of King Charles I, lived a few days longer than the King. The Pope dies of unknown causes. His critics will say he died of indigestion, but that seems like satire. He will be replaced by one of his appointees, Pope Honorius IV. His papacy will be undistinguished except for the notoriety of being the last of the married men to become Pope.   
A Slave Becomes Emperor
Insanity and murder seem to plague the Emperor's line of succession so when a former slave usurps the throne of the Empire of Mali in Africa, no one complains. At this point almost anyone could have done better that the previous Mansa (Emperor), but Mansa Sakura does very well indeed. Although he was born a slave he rises to the level of general, takes the throne to popular acclaim and reunites the Empire. He will be a better leader than Mali has seen in generations. Mansa Sakura's reign will last 13 productive years. After his death the succession will return to the original family line and Mali will hit the jackpot again. Mansa Musa will spread the wealth so liberally that gold prices in Egypt will fall, but that is far in the future. For now, Mansa Sakura is busy rebuilding an Empire.   
- Circumspecte Agatis Revisited, David Millon, Law and History Review Vol. 2, No. 1, Spring, 1984, pp. 105-127
- Year 1285, Wikipedia
- King Charles I of Naples, Wikipedia
- Pope Martin IV, Michael Ott, "Pope Martin IV", The Catholic Encyclopedia. Vol. 9. New York: Robert Appleton Company, 1910
- Pope Honorius IV, drawn from Wikipedia
- Mali Empire, from Afropedia
- The Cambridge History of Africa, Volume 3, edited by J.D. Fage and Roland Anthony Oliver, Cambridge University Press, Jan 20, 1977, p 380
- Mansa means Emperor, Wikipedia