1284

War and politics

 * King is captured in a naval battle off  by, admiral to King.
 * The is created, formally incorporating  into  in the entity.
 * The  of  defeats its rival  in the naval, ending Pisa's marine power and hastening the city's decline in power.
 * , king of, receives , , and other territories from when his son marries the king of Hungary's cousin.
 * sultan of  signs a ten-year truce with the  of ; he will violate the truce on pretexts in.
 * Second Mongol attack against, led by.
 * imposes a trade embargo on due to the latter pillaging a German ship. The embargo cut off vital supplies of grain, flour, vegetables and beer, causing a general famine.

Culture

 * The city of  is destroyed by a fire.
 * , the oldest college at the, is founded by.
 * The begins coining the, a   that is to become the standard of an coinage for the following 600 years.
 * Construction on the is interrupted by a partial collapse of the choir; the event unnerves  masons working in the  style.
 * translates ' military treatise  from  into.

Births

 * - King (died )
 * (died )
 * Count (died )

Deaths

 * - King (born )
 * -, son of (born )
 * , Flemish theologian
 * , regent of Holland
 * , Khan of the Mongol Empire
 * , regent of Japan (born )
 * , regent of Japan (born )

In legend

 * - According to legend, the visits the  town of  and leads 130 children to their deaths, as told in the tales of the  and many others.