What is a priest of Rome?

While writing a paper for school, I looked back at this answer so I could use that passage as a reference. In doing so, I got a good look at the title of the book, which I never had before. It’s called *In Reply to a Letter by W. A. Anderson, Sometime Vicar of St. Margaret's, Leicester—Now **Priest of Rome*** . It was written by “a layman,” but it was published in London in mdccclii (1852 in Arabic numerals). I thought the Pope was the Bishop of Rome and that when there’s a bishop there isn’t a priest. Is this book talking about the priest of a normal parish somewhere in Rome as opposed to the Vatican? The man wasn’t the pope. I’d look in the book to see if I could find what it says, but Google Books won’t let me read any more than I have. Ideally I’m looking for an answer that provides possible explanations for what office this W. A. Anderson held. Even better would be a source mentioning Father Anderson by name*. When it comes down to it, though, I’ll take any sourced answer I can get. Thanks for your time. *Does the RCC keep a database of priests somewhere?