Bartholomew is a character in American Horror Story. He is often associated with the strange and macabre events that are typical in the show's universe. However, without more specific information about which season or storyline, it's hard to give a more detailed account of his character.
In American Horror Story, Bartholomew is a character that contributes to the overall atmosphere of mystery and horror. He could be a part of a cult, or perhaps a victim of some sort of dark magic. Different seasons of the show have different themes and Bartholomew's role would be defined by the particular season he is in. For example, in a season focused on a haunted house, he might be one of the ghosts or entities that haunts the place.