Church of St. Euphemia (Chalkedon)

The Church of St. Euphemia in Chalkedon (modern Kadıköy, Istanbul) is an ancient Christian basilica built in the 4th century, dedicated to Saint Euphemia, a Christian martyr. It served as a significant religious site and was one of the earliest Byzantine churches, showcasing early Christian architecture. Over centuries, it underwent modifications and was used for various purposes. Today, it is a historical monument and museum, reflecting the rich spiritual and architectural heritage of early Christianity in the region.