Mr. Jephro Rucastle is a character from the Sherlock Holmes story "The Adventure of the Copper Beeches," written by Arthur Conan Doyle. He is the owner of a large house in the countryside and is known for his strict and controlling nature, particularly towards his family and servants. Rucastle is depicted as a wealthy man who employs a governess, Violet Hunter, to care for his children. His character is marked by a sense of mystery and suspicion, as he has a hidden agenda that unfolds throughout the story, revealing his darker motivations.