Catholic use tradition as the bible, because to find a reason to lie to it member.
For example, they said Peter is the first Pope in Rome from ad 32 to ad 67. It is not in the bible and if you read Act 28 at the arrival of Paul in ad 60, seem no Peter there, and Jew still don't quite understand about Christianity, Luke describe the Jew was listen to Paul from morning till evening. If Peter already there for 28 years I don't you think Peter evangelized them?
The letter from Paul to Rome mention about 38 elder and not mention Peter at all.
a. Why Paul write a pastoral letter to Rome if Peter, his boss is a bishop there. I never heard local priest wrote a pastoral Letter to Vatican.
b. If it does, why not greet Peter while he greet 38 elder.
My conclusion Peter is not bishop in Rome.
You can't use the bible to say Peter bishop Rome, that why need another resource to accommodate his lie, to make it look like the truth.