Ephesus was an important centre for Early Christianity from the AD 50s. From AD 52–54, Paul lived in Ephesus, working with the congregation and apparently organizing missionary activity into the hinterlands. He became embroiled in a dispute with artisans, whose livelihood depended on selling the statuettes of Artemis (Latin: Diana) in the Temple of Artemis (Diana) (Acts 19:23–41). Between 53 and 57 AD Paul wrote the letter 1 Corinthians from Ephesus (possibly from the 'Paul tower' near the harbour, where he was imprisoned for a short time). Later, Paul wrote the Epistle to the Ephesians while he was in prison in Rome (around 62 AD). [Wikipedia]
If you visit Ephesus today, you can only see the ruins of the foundations of the temple of Artemis.
Pauls letter to the Ephesians.
Revelation 2:1-7
To the Church in Ephesus
2 “To the angel of the church in Ephesus write:
These are the words of him who holds the seven stars in his right hand and walks among the seven golden lampstands. 2 I know your deeds, your hard work and your perseverance. I know that you cannot tolerate wicked people, that you have tested those who claim to be apostles but are not, and have found them false. 3 You have persevered and have endured hardships for my name, and have not grown weary.
4 Yet I hold this against you: You have forsaken the love you had at first. 5 Consider how far you have fallen! Repent and do the things you did at first. If you do not repent, I will come to you and remove your lampstand from its place. 6 But you have this in your favor: You hate the practices of the Nicolaitans, which I also hate.
7 Whoever has ears, let them hear what the Spirit says to the churches. To the one who is victorious, I will give the right to eat from the tree of life, which is in the paradise of God.
In Paul's footsteps - Ephesus [Youtube video]