1411

January–December

• February 1 - The First Peace of Thorn is signed at Thorn in the Monastic State of the Teutonic Knights, ending the Polish–Lithuanian–Teutonic War.
• July 6 - Ming Dynasty Admiral Zheng He returns to Nanjing after his second voyage, and presents the Sinhalese king, captured during the Ming–Kotte War, to the Yongle Emperor.
• July 24 - Battle of Harlaw in Scotland: Domhnall of Islay, Lord of the Isles, and an army commanded by Alexander Stewart, Earl of Mar battle to a bloody draw.
• September 3 - The Treaty of Selymbria is concluded between the Ottoman Empire and the Republic of Venice.
• September 21 - King Henry IV of England calls his ninth parliament.
• November 30 - Henry IV dismisses Prince Henry and his supporters from the government.

  Date unknown

• The University of St Andrews is founded by a papal bull.
• Under the Yongle Emperor of Ming China, work begins to reinstate the ancient Grand Canal of China, which fell into disuse and dilapidation during the previous Yuan Dynasty. Between 1411 and 1415, a total of 165,000 laborers dredge the canal bed in Shandong, build new channels, embankments, and canal locks. Four large reservoirs in Shandong are also dug, in order to regulate water levels, instead of resorting to pumping water from local tables. A large dam is also constructed, to divert water from the Wen River southwest into the Grand Canal.
• Constantinople is briefly besieged by the Ottoman pretender Musa Çelebi, due to Byzantine support for Süleyman Çelebi during the Ottoman Interregnum.
• The Battle of İnceğiz between the rival brothers Mehmed Çelebi and Musa Çelebi, during the Ottoman Interregnum.