Historical Events Apr 5 200 Brussel nobles offer Margaretha of Parma a petition Famous Deaths Apr 25 Diane de Poitiers, French mistress of French King Henry II, dies at 66 Apr 25 Louise Labé, French poet Mar 1566 History by Year May 1566 Famous People by Cause of Death Assassination Drug Overdose Gunshot Wound Murder Plane Crash Suicide