Professor Merrythought

Professor Merrythought was the Defense Against the Dark Arts teacher at Hogwarts for nearly fifty years, a figure whose retirement in the 1940s became a fulcrum around which the fates of Tom Riddle and Albus Dumbledore turned. Her departure created the vacancy that Riddle, then a brilliant and ambitious seventh-year student, desperately wanted to fill, and that Dumbledore, already wary of him, was determined to prevent. The struggle over her successor would reveal the depth of Riddle's designs on the school and, ultimately, curse the post she had held for half a century.

Identity and Long Tenure

Professor Merrythought had taught Defense Against the Dark Arts at Hogwarts for nearly fifty years by the time of her retirement. She was an old colleague of Horace Slughorn, who remembered her fondly enough to mention her name in conversation with his favorite students. Her long service made her a fixture of the school, and her departure marked the end of an era. The position she vacated was one of great influence, and it was this influence that both Riddle and Dumbledore recognized as a prize worth contesting.

The Vacancy and Riddle's Ambition

When Merrythought retired, Tom Riddle, then a seventh-year student and Head Boy, immediately saw an opportunity. He approached the then-headmaster, Armando Dippet, and asked to remain at Hogwarts as a teacher. Riddle's motives were complex: he was more attached to Hogwarts than to any person, he saw the castle as a repository of ancient magic whose secrets he had not yet exhausted, and he understood that a teaching post would give him great power and influence over young witches and wizards, a recruiting ground for his future army. He specifically wanted Merrythought's subject, Defense Against the Dark Arts. Dumbledore, then a teacher himself, advised Dippet against the appointment, though he did not reveal his full reasons. Dippet told Riddle he was too young at eighteen but invited him to reapply in a few years.

Dumbledore's Refusal and the Jinx

Years later, after Merrythought had long since retired and Dumbledore had become headmaster, Riddle—now calling himself Lord Voldemort—returned to Hogwarts to request the teaching post once more. He appeared at Dumbledore's office on a snowy night, surrounded by his followers, including Nott, Rosier, Muldber, and Dolohov, who waited for him at the Hog's Head. Dumbledore refused him outright, and the meeting ended in cold fury. The aftermath of this refusal was extraordinary: from that point onward, no Defense Against the Dark Arts teacher ever lasted more than a year at Hogwarts. The jinx that Dumbledore himself identified as a consequence of his refusal to give the post to Voldemort began with Merrythought's retirement and the vacancy it created, and it would claim a succession of teachers—Quirrell, Lockhart, Lupin, Moody, and Umbridge—before the cycle was broken.

Significance

Professor Merrythought's retirement was the catalyst for a chain of events that defined the struggle for Hogwarts and the war against Voldemort. Her departure gave Riddle his first clear shot at the position he craved, and Dumbledore's refusal to grant it to him—first as an advisor to Dippet, then as headmaster—cemented the enmity between them. The jinx that followed, which made the Defense Against the Dark Arts post a revolving door of incompetence, tragedy, and danger, was a direct consequence of Merrythought's departure. She herself remains a shadowy figure, known only through the vacancy she left behind, but that vacancy shaped the careers of those who followed and the fate of the school itself.