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? 
Robbie Coltrane: Robbie Coltrane, OBE (born Anthony Robert McMillan; 30 March 1950) is a Scottish actor and author. Rubeus Hagrid: Rubeus Hagrid is a fictional character in the "Harry Potter" book series written by J. K. Rowling.
i don't know