The Seven Churches of Revelation, also known as The Seven Churches of the Apocalypse and The Seven Churches of Asia (referring to the Roman province of Asia, not the entire continent), are seven major churches

Christian Church

The Christian Church is the assembly or association of followers of Jesus Christ. The Greek term ἐκκλησία that in its appearances in the New Testament is usually translated as "church" basically means "assembly"...

 of Early Christianity, as mentioned in the New Testament

New Testament

The New Testament is the second major division of the Christian biblical canon, the first such division being the much longer Old Testament....

 Book of Revelation

Book of Revelation

The Book of Revelation is the final book of the New Testament. The title came into usage from the first word of the book in Koine Greek: apokalupsis, meaning "unveiling" or "revelation"...

 and written to by Ignatius of Antioch

Ignatius of Antioch

Ignatius of Antioch was among the Apostolic Fathers, was the third Bishop of Antioch, and was a student of John the Apostle. En route to his martyrdom in Rome, Ignatius wrote a series of letters which have been preserved as an example of very early Christian theology...

. All seven sites are in modern-day Turkey

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 and no longer have significant Christian populations since they were emptied of Christians under the Treaty of Lausanne

Treaty of Lausanne

The Treaty of Lausanne was a peace treaty signed in Lausanne, Switzerland on 24 July 1923, that settled the Anatolian and East Thracian parts of the partitioning of the Ottoman Empire. The treaty of Lausanne was ratified by the Greek government on 11 February 1924, by the Turkish government on 31...

.