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.
John II of Castile declares the Valladolid laws, that restrict the social rights of Jews. Among many other restrictions, the laws force Jews to wear distinctive clothes, and deny them administrative positions.
The TibetanlamaJe Tsongkhapa, of the Gelug school of Buddhism, declines the offer of the Yongle Emperor of China to appear in the capital at Nanjing, although he sends his disciple Chosrje Sh?kya Yeshes, who is given the title "State Teacher". The later Xuande Emperor will grant Yeshes the title of a king, upon a return visit to China (to the new capital at Beijing).
June 5 – The Council of Constance condemns the writings of John Wycliffe and asks Jan Hus to recant in public his heresy; after his denial, he is tried for heresy, excommunicated, then sentenced to be burned at the stake.
The Grand Canal of China is reinstated by this year after it had fallen out of use; restoration began in 1411, and was a response by the Yongle Emperor of the Ming Dynasty to improve the grain shipment system of tribute traveling from south to north, towards his new capital at Beijing. With this action, the food supply crisis is solved by the end of the year.
The Orthodox Church in the lands of the tsardom of Muskovy (actual Russia) separates from the one in Ukraine and Belarus, both patriarchate.1422 to be the true Kiev patriarchate.
August 12 – King Henry V of England begins using English in correspondence (back to England from France whilst on campaign), marking the beginning of this king's continuous usage of English in prose, and the beginning of the restoration of English as an official language for the first time since the Norman Conquest, some 350 years earlier.
The Timurid ruler of Persia, Mirza Shahrukh (r. 1404–1447), sends a large embassy to the court of the Yongle Emperor of China. One of the Persian envoys, Ghiy?th al-d?n Naqq?sh, keeps a diary of his travels throughout China, which soon becomes widely known throughout Iranian and the Turkic Middle East, thanks to its inclusion into historical works by Hafiz-i Abru, and Abdur Razzaq. Naqqash writes about China's wealthy economy and huge urban markets, its efficient courier system as compared to that in Persia, the hospitality of his hosts at the courier stations in providing comfortable lodging and food, and the fine luxurious goods and craftsmanship of the Chinese.