Year 1281 (MCCLXXXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
August 12 – Battle of Kōan (Hakata Bay): The second Mongol invasion of Japan is foiled, as a large typhoon – famously called a kamikaze, or divine wind – destroys much of the combined Chinese and Korean fleet and forces, numbering over 140,000 men and 4,000 ships.
Kublai Khan orders the burning of sacred Taoist texts, resulting in the reduction in number of volumes of the Daozang (Taoist Canon) from 4,565 to 1,120.
The Mon kingdom of Haripunchai falls as its capital Lamphun (in present-day Thailand) is captured by King Mangrai's Lannathai kingdom.
Middle East
October 29 – Mamluk sultan Qalawun defeats an invasion of Syria by Mongol Ilkhan Abaqa Khan in the Second Battle of Homs.
Osman I, founder of the Ottoman Empire, becomes bey of the Sögüt tribe in central Anatolia; in 1299 he will declare independence from the Seljuk Turks, marking the birth of the Ottoman Empire.
An offensive by the Byzantine Empire significantly reduces the size of the Kingdom of Albania, as it recaptures land seized from the Despotate of Epirus by Charles I of Sicily 10 years earlier.
Pope Martin IV authorizes a Crusade against the newly re-established Byzantine Empire in Constantinople; French and Venetian expeditions set out toward Constantinople but are forced to turn back in the following year.
July – Niccolò Bonsignori heads a hundred of Ghibelline exiles in a failed attempt to topple the Sienese government.
Guy of Dampierre, count of Flanders, licenses the first Lombards merchants to open a changing business in his realm.
Pope Martin IV succeeds Pope Nicholas III as the 189th pope.
Castruccio Castracani, duke of Lucca (d. 1328)
Yuri III Danilovich, Grand Prince of Russia (d. 1325)
Henry, 3rd Earl of Lancaster (d. 1345)
Hamdallah Mustawfi, Ilkhanid Iranian historian (d. 1349)
Rudolf I of Bohemia (d. 1307)
February 16 – Gertrude of Hohenburg, queen consort of Germany (b. c.1225)
September 10 – John II, Margrave of Brandenburg-Stendal (b. 1237)
October 8 – Princess Constance of Greater Poland (b. c.1245)
December 24 – Henry V, Count of Luxembourg (b. 1216)
date unknown – Ertuğrul, father of Osman I (b. 1198)
1281 Wikipedia (Text) CC BY-SA