The Cathedral of the Holy Savior in Istanbul, also known as Chora Church, is a historic Byzantine church located in the Edirnekapı neighborhood. Originally built in the 4th century, it was later reconstructed in the 11th century and is renowned for its stunning mosaics and frescoes that depict biblical scenes. In 1453, following the conquest of Constantinople by the Ottomans, the cathedral was converted into a mosque. Today, it serves as a museum, showcasing its rich history and artistic heritage, attracting visitors interested in Byzantine architecture and art.