Rubeus Hagrid is a character in the J.K. Rowling "Harry Potter" book series. A teacher and groundskeeper at Hogwarts, the school that Harry Potter attends, Hagrid is a friend of Harry, Ron, and Hermione. Hagrid is also a "half-giant." His father was not a giant, whereas his mother, Fridwulfa, who abandoned him when he was just an infant, was a giantess. He has a half-brother named Grawp. In the "Harry Potter" movies, Hagrid is played by Robbie Coltrane. Martin Playfield appears as a young Hagrid in "Harry Potter and the Chamber of Secrets".