Colossae & Laodicea - Paul (or one of his followers) wrote letters to the Christians in both these cities (Col 2:1; 4:13-16; also Rev 1:11; 3:14) Ephesus, Smyrna, Pergamum, Thyatira, Sardis ...
When writing to Corinth, he dealt with their divisiveness, sexual immorality, and faulty understanding of spiritual gifts. When writing to Colossae, he primarily addressed a dangerous mixture of proto ...