Epaphras (who started the church in Colossae; see Colossians 1:7), who is a servant of Jesus Christ from Colossae, sends his greetings. He is always wrestling (fighting) in prayer for you, so that you will stand strong in God’s will, mature and full of assurance. I can tell you that Epaphras is working hard for you in Colossae and for the believers in the neighboring cities of Laodicea and Hierapolis (modern Pemukkale). (Colossae, Laodicea, and Hierapolis are all located in the Lycus Valley of modern Turkey).
Source: The Apostle Paul - Colossians 4:12-13
Quotation from the International English Bible (IEB), in which Dr. Andrew Jackson embeds fantastic inline notes to help those new to the Bible to better understand the context of each passage