Paul.
Paul wrote 13 epistles and not 21 epistles in the new testament.
Epistles. The majority of New Testament writings are epistles of Paul, James, Peter, John, and Jude with the anonymous Hebrews.
The whole new testament was written in Greek and pauline's epistles as well.
There are three types of books in the New Testament. They are the Historical Books, Pauline Epistles, and General Epistles
The word epistle means in letter form. most of the Epistles written in the New Testament were written by Paul.
There are 21 epistles in the New Testament. Also, if you read Revelation chapters 1 - 3 you will notice 7 more epistles (letters) that truly should be included in the count, making it a total of 28. Most people don't think to include them as epistles but they are 7 letters going to 7 churches and the definition of "epistle" is a writing directed or sent to a person or group of people".
Paul was the main writer of letters (epistles) in the New Testament.
Paul, Peter, John, James, and Jude all wrote epistles that formed part of the New Testament.
Donald Guthrie has written: 'Pastoral Epistles (Tyndale New Testament Commentaries)' 'Kommentar zur Bibel. AT und NT in einem Band' 'The apostles' -- subject(s): Apostles, Bible, History of Biblical events 'Jesus the Messiah' -- subject(s): Biography 'Apostles, The' 'Guthrie New Testament Reference Set' 'The Epistle to the Hebrews (Tyndale New Testament Commentaries)' 'New Testament introduction; the Pauline Epistles' -- subject(s): Introductions, Bible 'New Testament introduction' -- subject(s): Introductions, Bible 'The Pastoral Epistles'
The Epistles
If you're referring to St. Paul's letters in the New Testament, they are called epistles.
Paul's two Epistles to the Thessalonians (1 and 2) are in the New Testament.