It appears you're referring to St. Jean Church. There are several churches dedicated to Saint John (Jean in French), and one notable example is the Basilica of St. John in Selçuk, Turkey.

St. John's Basilica (Basilica of St. John):

Location:

The Basilica of St. John is located on Ayasuluk Hill in Selçuk, near the ancient city of Ephesus.

Historical Significance:

This basilica is believed to be built over the burial site of St. John the Apostle, who is traditionally associated with the writing of the Gospel of John.

Construction and Architecture:

The basilica was constructed during the Byzantine era in the 6th century AD. It was a large cross-shaped church with a monumental dome and featured several chapels, an atrium, and a baptistery.

Destruction and Reconstruction:

The basilica suffered damage over the centuries due to earthquakes and invasions. The building was eventually abandoned and fell into ruins. However, parts of it were later used in the construction of the Isa Bey Mosque in the 14th century.

Archaeological Site:

Today, visitors can explore the archaeological site of St. John's Basilica. The remaining structures provide insights into the grandeur of the original basilica, and the location offers panoramic views of the surrounding landscape.

Biblical Connections:

St. John, one of the Twelve Apostles of Jesus, is traditionally identified as the author of the Gospel of John, the Book of Revelation, and three epistles in the New Testament. The association of the basilica with his burial place adds to its religious significance.

Visiting St. John's Basilica allows individuals to delve into both religious history and the architectural achievements of the Byzantine period in this region. It stands as a testament to the enduring legacy of St. John and the cultural heritage of the area.