1351

January, December

• January 14 , Edward III of England institutes the Treason Act 1351, defining treason in English law. It remains unrepealed into the 21st century.
• February , Enactments by the Parliament of England:
  • The Statute of Labourers deals with a labour shortage caused by the Black Death.
  • Statute of Provisors prevents the Pope from appointing clergy to English benefices.
• March 4 , The Ayutthaya Kingdom is established by King Uthong (Ramathibodi I) in modern-day Thailand. He begins to propagate Theravada Buddhism as the state religion.
• March 23 , Firuz Shah Tughlaq succeeds Mohammad Tughlaq as ruler of the Delhi Sultanate. At this time, the Samma dynasty in Sindh (part of modern-day Pakistan) breaks away from the Sultanate.
• March 26 , War of the Breton Succession: Combat of the Thirty , Thirty chosen knights each, from the Kingdoms of France and England, fight to determine who will rule the Duchy of Brittany; a Franco-Breton victory is assured by the squire Guillaume de Montauban.
• April 1 , Hundred Years' War: Battle of Saintes. , The French are defeated by the English.
• April 8 , Hundred Years' War: Battle of Taillebourg. , The French are defeated by the English.
• May 1 , Zürich joins the Old Swiss Confederacy.
• November 26 , Emperor Sukō abdicates as 3rd Emperor of the Northern Court of Japan.

Date unknown

• The Red Turban Rebellions break out in China, leading to permanent weakening of the Mongolian-run Yuan dynasty.
• King Gongmin ascends the throne in Goryeo.
• The region of Vantaa in Finland is first mentioned (as Helsinge).

• October 16 , Gian Galeazzo Visconti, first Duke of Milan (d. 1402)
• November 1 , Leopold III, Duke of Austria (d. 1386)
• Princess Joan of France (d. 1371)
• probable , Władysław II Jagiełło, Grand Duke of Lithuania and King of Poland (d. 1434)

• February 13 , Kō no Morofuyu, Japanese general
• March 20 , Muhammad bin Tughluq, Sultan of Delhi
• March 25
  • Kō no Moronao, Japanese samurai
  • Kō no Moroyasu, Japanese samurai
• May 24 , Abu al-Hasan Ali ibn Othman, Sultan of Morocco (b. 1297)
• June 20 , Margareta Ebner, German nun (b. 1291)
• November 15 , Joanna of Pfirt, duchess consort of Austria