It's possible that:
* The name is misspelled. Perhaps there's a similar name, like Bartholomaeus of Rossano or Bartolomeo da Rossano, that you're thinking of.
* The author is obscure. If the author is not well-known, their works might not be readily available online or in libraries.
* The author is fictional. It's possible the name is part of a fictional story or character.
Could you provide more context about where you encountered this name? Knowing more details might help identify the correct author or source.