Question: What is the name of the actor who played the role of the person who is Keeper of Keys and Grounds of Hogwarts in "Harry Potter" films? 
Sentence (from "Rubeus Hagrid"): In the third novel "Harry Potter and the Prisoner of Azkaban", Hagrid is promoted to Care of Magical Creatures teacher, and is later revealed to be a member of the Order of the Phoenix.
Relevant evidence: No