When was Galatians written relative to the Corinthian letters?
Galatians was written probably about a couple of years before the Corinthian letters. The context explains that Paul's New Testament books are not arranged in chronological order, so Galatians precedes the Corinthian correspondence in time even though the canon may place them differently.
Les teaches that Galatians was written probably a couple of years before the Corinthian letters. He notes that the books of Paul in our New Testament are not in the order in which they were written chronologically. He also explains that this chronological point had been made when the study in Romans first started many, many months earlier. The broader context shows Galatians was sent to congregations facing Judaizers, warning believers that they are not under Law but under Grace.