Year 1321 was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events of 1321 Battle on the Irpen' River: The Grand Duchy of Lithuania defeats Prince Stanislav of Kiev. Stefan Decanski becomes King of Serbia. A bad harvest brings famine, starvation and death in Europe. Births February 5 - John II, Marquess of Montferrat (d. 1372) July 5 - Joan of The Tower, queen consort of Scotland (d. 1362) September 29 - John of Artois, Count of Eu, Fren… (More on 1321)