The Church of St. Mary of Blachernae is a historic and religious site located in Istanbul, Turkey. The church is named after the Blachernae district where it is situated and is considered to be one of the most important religious sites in the city.

The church dates back to the Byzantine era and was first constructed in the 5th century. It underwent several renovations and expansions over the years, particularly during the 9th century when it was expanded into a complex of chapels, monasteries, and courtyards.

The church is particularly famous for its holy relic, the Virgin Mary’s robe or “mantle” which was believed to be brought to the church by the Virgin Mary herself in the 5th century. The mantle was said to have miraculous powers and was believed to protect the city and its inhabitants from disasters and attacks. The mantle was kept in the church until the Ottoman era when it was transferred to the Haghia Sophia.

The church’s interior is adorned with beautiful frescoes and mosaics, including an impressive depiction of the Virgin Mary holding the mantle. The main chapel is also home to the altar of the Holy Mother, a magnificent iconostasis, and a marble pulpit.

Today, the Church of St. Mary of Blachernae continues to be a place of pilgrimage for Christians and a popular tourist attraction in Istanbul. Visitors can explore the church’s rich history and stunning architecture, as well as learn about its cultural and religious significance.