» For the controversial hypothesis advanced by Gavin Menzies, see: 1421 hypothesis. For the book, see: . Year 1421 was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. Events of 1421 March 21 - Battle of Baugé: A small French force surprises and defeats a smaller English force under Thomas, Duke of Clarence, a brother of Henry V of England, in Normandy. May 26 - Mehmed I, Sultan of the Ottoman Empire, dies and is succeeded by his son Mur… (More on 1421)