Births on September 29

Margaret of England, Queen consort of Scots (d. 1275)

Margaret of England (29 September 1240 – 26 February 1275) was Queen of Scots by marriage to King Alexander III.

12 Jun

Disputation of Paris
At the instigation of Louis IX of France, an inter-faith debate, known as the Disputation of Paris, starts between a Christian monk and four rabbis.
15 Jul

Battle of the Neva
Swedish-Novgorodian Wars: A Novgorodian army led by Alexander Nevsky defeats the Swedes in the Battle of the Neva.
6 Dec

Siege of Kiev (1240)
Mongol invasion of Rus': Kiev under Daniel of Galicia and Voivode Dmytro falls to the Mongols under Batu Khan.