Jun 22 Ghiyath al-Kashi, Persian astronomer and mathematician (b. 1380) Jul 12 Jean de Gerson, French theologian (Theologica mystic), dies at 65 Sep 28 Cymburgis of Masovia, wife of Duke Ernest of Austria 1428 Famous Deaths by Year 1430 Famous People by Cause of Death Assassination Car Crash Hanging Killed in Action Plane Crash Poisoning