Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Passage: After his stern Uncle Daniel describes him as a "millstone" for neglecting his chores, ten year old Toby Tyler runs away from his foster home to join the circus. There he soon befriends Mr. Stubbs, a frisky chimpanzee. However, the circus isn't all fun and games. His employer Harry Tupper, the candy vendor, is dishonest and greedy. He convinces Toby that his Aunt Olive and Uncle Daniel don't love him or want him back and hides their letters. Toby resigns himself to circus life, even scoring himself a much bigger role, when he replaces the uppity, self-centered boy bareback rider after an injury. When Toby discovers, with the help of Mr. Stubbs, that Harry lied to him about his aunt and uncle he departs the circus for home. Mr. Stubbs follows him and Toby decides to take the chimp home with him. Soon after, though, Mr. Stubbs is chased by a hunter's dog. The hunter, Jim Weaver, accidentally shoots Mr. Stubbs just as Harry arrives to haul Toby back to the circus.  
Back at the circus, Toby finds his aunt and uncle in attendance, leading to a tearful reunion. When Harry tries to pursue Toby, he's obstructed by Ben, who confronts him for tampering with Toby's mail and warns him to leave him alone. Joyfully, just before Toby's performance, with his family in attendance, he discovers that Mr. Stubbs has survived his wounds, having been brought back to the circus by Jim. Relieved, Toby begins his performance on horseback, only to have Mr. Stubbs jump down from the trapeze to join him, thus creating a wonderful new act for the circus.
A:
What is the name of the person that caused Toby Tyler to run away to the circus?