Paul had not yet been in Rome, at least since his conversion; it is possible that prior to his conversion he had been in Rome. But the community in Rome had many of his converts. Paul in these verses sends greetings to very dear friends; their number alone makes up a sizeable congregation. Some churches had meetings in their homes, some of these men had turned their homes into churches. We see references to this in verses 5, 10, 11, 14, and 15. So there were possibly five congregations, all apparently a product of Paul’s ministry.