2 Corinthians 1:1
Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother,
To the church of God in Corinth, together with all his holy people throughout Achaia:
“Paul visited Corinth on his second missionary journey and founded a church there (Acts 18:1ff). He later wrote several letters to the believers in Corinth, two of which are included in the Bible. Paul’s first letter to the Corinthians is lost (1 Corinthians 5:9-11), his second letter to them is our book of 1 Corinthians, his third letter is lost (2:6-9; 7:12), and his fourth letter is our book of 2 Corinthians. Second Corinthians was written less than a year after 1 Corinthians.” (Life Application Study Bible 1940)
“Paul wrote 1 Corinthians to deal with divisions in the church. When his advice was not taken and their problems weren’t solved, Paul visited Corinth a second time. That visit was painful both for Paul and for the church (2:1). He then planned a third visit, but delayed it and wrote 2 Corinthians instead. After writing 2 Corinthians, Paul visited Corinth once more (Acts 20:2, 3).” (Life Application Study Bible 1940)
Life Application Study Bible. Zondervan, 2011. p. 1940.