June 26 » Western Schism: The Roman Catholic Church is led into a double schism as Petros Philargos is crowned Pope Alexander V after the Council of Pisa, joining Pope Gregory XII in Rome and Pope Benedict XII in Avignon.
September 23 » The Battle of Kherlen is the second significant victory over Ming dynasty China by the Mongols since 1368.
When copying data from this family tree, please include a reference to the origin: Enno Borgsteede, "Borgsteede family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-borgsteede/I2159.php : accessed January 24, 2026), "Sir William Willoughby , Lord Eresby, 5th Baron of Willoughby, Knight of the Garter (1371-1409)".
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