prison letters, or the letters of Saint Paul
Letters or epistles.
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.
He sent them letters - Epistles.
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
To encourage those he was writing to and to instruct them in the ways of the Messiah.
Saint Paul lived approximately from the year 5 until approximately the year 67. He probably wrote his letters in the middle and late parts of his life. There are several letters written in Paul's name that most likely were written by others.
That would be Saint Paul, formerly Saul of Tarsus.