Today in History for May 1st

Goguryeo-Sui War: In response to a Goguryeo (Korean) incursion into Liaoxi, Emperor Wéndi of Sui orders his youngest son, Yang Liang (assisted by the co-prime minister Gao Jiong), to conquer Goguryeo during the Manchurian rainy season, with a Chinese army and navy.<span class="mw-reflink-text" id="...

Second Barons' War: Battle of Evesham: The army of Prince Edward (the future king Edward I of England) defeats the forces of rebellious barons led by Simon de Montfort, 6th Earl of Leicester, killing de Montfort and many of his allies.

First War of Scottish Independence: James Douglas leads a raid into Weardale and almost kills Edward III of England.

Battle of Al Kasr al Kebir: The Moroccans defeat the Portuguese. King Sebastian of Portugal is killed in the battle, leaving his elderly uncle, Cardinal Henry, as his heir. This initiates a succession crisis in Portugal.

Date traditionally ascribed to Dom Perignon's invention of champagne; it is not clear whether he actually invented champagne, however he has been credited as an innovator who developed the techniques used to perfect sparkling wine.

Great Peace of Montreal between New France and First Nations is signed.