This answer confused me. I tried wading through the sources, but then I decided I'd just ask here. According to Catholic dogma:
Was Peter ever in Rome? I'm sure the answer is yes, but I'd like to see sources.
Was Peter a "bishop"? If so, what does that mean in Peter's case?
Was there a shift during the first two centuries in the structure of the church government at Rome, from a "college of presbyters" to a monarchical bishop? If so, how did that shift come about?
Did Peter die in Rome?
To be clear on what kinds of sources I'm looking for, here's what I expect to see for each bullet point:
An appeal to the infallible sacred magisterium, or an indication that the answer hasn't been infallibly/dogmatically given to the church.
If it hasn't been dogmatically defined, then an appeal to the ordinary magisterium.
If the ordinary magisterium is unclear or inconclusive on a certain point, I'd like that fact to be spelled out in the answer. If that's the case, I'd like an overview of Catholic approaches to the issue.