Barnabas the Barmy was a wizard who made a foolish attempt to train trolls for the ballet.  A moving tapestry depicting his attempt hung on the seventh floor of Hogwarts School of Witchcraft and Wizardry, opposite the entrance to the Room of Requirement. 
- "Barnabas" is a Greek form of an Aramaic name. In Acts in the New Testament the byname Barnabas was given to a man named Joseph, a companion of Paul on his missionary journeys. The original Aramaic is unattested, but it may be from בּר נביא (bar naviya') meaning "son of the prophet", though in Acts 4:36 it is claimed that the name means "son of encouragement". As an English name, it came into occasional use after the 12th century.
- According to the Oxford Dictionary of English, the word "barmy" is an informal adjective, chiefly used in Britain that means mad, crazy or extremely foolish.
Behind the Scenes
Actor Mason Kayne was considered for the role of Barnabas the Barmy to in the tapestry outside the Room of Requirement in the film, but the scenes were never filmed and the tapestry is not present in the corridor.
- Harry Potter and the Order of the Phoenix (Appears on a tapestry)
- Harry Potter and the Half-Blood Prince (Appears on a tapestry)
- Harry Potter and the Half-Blood Prince (video game) (Appears on a tapestry)
- Harry Potter: The Creature Vault