Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:
All Commentaries on Romans 15:20 Go To Romans 15
Gennadius of Constantinople
AD 471
The explanation as to why Paul had not yet managed to visit the Romans seems to be that he believed that Peter had already come to them as their teacher, so he went to places where as yet no one had preached the gospel of Christ. .
