What has grimsby roylott in Sherlock Holmes done before?

Grimsby Roylott, a character in Arthur Conan Doyle's "The Adventure of the Speckled Band," is known for his violent and unscrupulous behavior, particularly in relation to his stepdaughters. Before the events of the story, he had been involved in numerous incidents of aggression, including the mysterious deaths of his first wife and his stepdaughter, Julia Stoner. His financial troubles and desperate desire to retain control over the family estate drive him to commit heinous acts. Ultimately, he is revealed to have used a trained snake to murder Julia, showcasing his cunning and brutality.