Mar 22 In the year 1421 death of thomas of Lancaster, 1st Duke of Clarence, second son of Henry IV of England (killed in battle) (b. 1388)
May 26 In the year 1421 mohammed I, sultan of Turkey (1413-21), dies
Jun 21 Jean Le Maingre, Marshal of France (b. 1366) died in the year 1421.