Mar 22 Thomas of Lancaster, 1st Duke of Clarence, second son of Henry IV of England (killed in battle) (b. 1388) May 26 Mehmed I, Ottoman Sultan (1413-21). B. 1389. Jun 21 Jean Le Maingre, Marshal of France (b. 1366) 1420 Famous Deaths by Year 1422 Famous People by Cause of Death Assassination Car Crash Hanging Killed in Action Plane Crash Poisoning