Ok, to be fair, it’s not like King Henry VIII of England executed all of his wives.
Let’s go through the roster of King Henry’s wives that died or were murdered.
Catherine of Aragon: marriage annulled, died a natural death shortly thereafter;
Anne Boleyn: beheaded;
Jane Seymour: died in childbirth;
Anne of Cleves: marriage annulled;
Catherine Howard: beheaded;
Catherine Parr: still alive and married to Henry when he died.