Who lives in the lawn of stoke Moran?

In Arthur Conan Doyle's Sherlock Holmes story "The Adventure of the Speckled Band," the character who lives in the grounds of Stoke Moran is Dr. Grimesby Roylott. He is the antagonist and stepfather of Helen Stoner, the story's female protagonist, who seeks Holmes's help regarding the mysterious death of her sister. Roylott is depicted as a violent and menacing figure, residing in the decaying estate.