January 4 : Anna of Brittany announces that all those who would ally with the king of France will be considered as guilty of the crime of lese-majesty.
Leonardo da Vinci develops an oil lamp: the flame is enclosed in a glass tube placed inside a water-filled glass globe.
The Chinese scholar and printer Hua Sui invents bronze-metal movable typeprinting in China, although the earlier Wang Zhen had experimented with tin movable type in 1298 and the Koreans had separately innovated bronze movable type.