“Without doubt…the least important church to which any epistle of Paul is addressed.” J. B. Lightfoot, Colossians, 16.
By the first century, the city of Colossae could only be described as a “small town” by Strabo, (Geography, 7.8.13.) Little is known about the town in this period other than it was nearly destroyed by an earthquake in A.D. 60/61. The cities of Laodicea and Hierapolis are quickly rebuilt; Laodicea can even be described as “rich” when the book of Revelation is written thirty years later. Colossae probably never recovered from this disaster.
The church at Colossae was founded by Epaphras, a disciple of Paul from Ephesus (cf. 1:7, 4:12). Epaphras is called a “faithful minister” (verse 7). The name is short for Epaphroditus, a name common in the first century (c.f., Phil 2:25, 4:13, Philemon 23). An inscription was found in Colossae mentioning a T. Asinius Epaphroditus, although it is unlikely this is the biblical Epaphras (F. M. Gillman, 2:533).
Epaphras was from Colossae (4:12) and may be an evangelist in the Lycus valley. The cities of Laodicea and Hierapolis both had thriving churches in the first century (4:12, Rev 3:14-22). Paul tells the church that Epaphras has reported their faith to Paul, and in 4:12 Paul describes himself as “wrestling in prayer” on behalf of the church while he is working hard in other churches. The Colossian believers learned from Epaphras, who learned from Paul.
The verb μανθάνω is associated with “systematic instruction” rather than a brief outline (BDAG). Perhaps Paul used this verb in order to set the gospel preached by Epaphras apart from the Colossian heresy. Epaphras was disciple by Paul and trained to be an evangelist and church planter by the apostle Paul himself. The opponents do not appear to be associated with anyone in the apostolic circle and their teaching is not approved by Paul. In fact, the bulk of the letter engages the ideas of the opponents in order to show their teaching falls short of the Gospel.
Paul may associate himself with Epaphras in this letter because his opponents in Colossae are question his credentials–who is Epaphras to be teaching the congregation spiritual things? The church may be influenced by other teachers for guidance rather than a young evangelist like Epaphras. Paul gives Epaphras has his personal approval in the opening of this letter, what Epaphras teaches is exactly what Paul taught.
This prayer also serves to underscore the authority of a local pastor-evangelist who was questioned by his church. Paul lets the church know from the first paragraph that he will be siding with Epaphras in any theological debates in the church!