There is no general agreement as to the exact years that Paul wrote his letters but, based on the chronology of Acts of the Apostles, the genuine epistles are usually dated to between 48 and 62 CE.
Another view, based on the references to the collection that Paul spent so much effort and personal capital on achieving, is that the genuine letters were written between about 44 and 48 CE.
the church
prison letters, or the letters of Saint Paul
Letters or epistles.
christians
Saint Paul
Saint Paul is the best known.
Paul sent letters (epistles) to various Churches in the areas he served.
The new testament
I do not think so , as it was not clearly mentioned.
The consensus of scholars is that Romans, 1 Corinthians, 2 Corinthians, Philemon, Galatians, Philippians and 1 Thessalonians are genuine letters written by the apostle Paul. Ephesians, Colossians, 2 Thessalonians, 1 Timothy, 2 Timothyand Titus were written in Paul's name, but long after his death.
St. Paul kept in touch with the churches he set up through letters. He wrote letters to address issues, provide teaching, and offer guidance to the early Christian communities. These letters were later compiled into the New Testament of the Bible.
There is no Saint Paul chapter 20-21 in the Bible. The apostle Paul wrote several letters in the New Testament but none of them have 20 chapters