Mary Blandy

Mary Blandy (1720 – April 6, 1752) was a female murderer in 18th century England. In 1751, she poisoned her father, Francis Blandy, with arsenic. She claimed that she thought the arsenic was a love potion that would make her father approve of her relationship with William Henry Cranstoun, an army officer and son of a Scottish nobleman.

Background

Mary's parents raised her to be an intelligent, articulate Anglican woman. Her reputation in Henley, where she lived her entire life, was that of a well-respected, well-mannered, and well-educated young woman. In 1746, Mary met Captain William Henry Cranstoun. The two intended to marry in 1751. However, it was exposed that he was married to a woman in Scotland and had a child by this marriage. Cranstoun denied the validity of this marriage and made several trips to Scotland over the course of his relationship with Mary to have the marriage annulled.

After months of stalling, Mary's father, Francis Blandy, became suspicious of Cranstoun and believed that he did not intend to leave his wife. Mr. Blandy made no attempt to hide his disapproval of Cranstoun's marriage. What happened next is unclear. Mary claimed that Cranstoun sent her a love potion (which later turned out to be arsenic) and asked her to place it in her father's food to make him approve of their relationship. Mary did this, and her father died.