The Hagia Sophia of İznik, also known as the Church of the Holy Wisdom, is a historic building located in the town of İznik, Turkey. Originally constructed as a Christian basilica in the 4th century, it served as an important center for the early Christian church. The structure features stunning mosaics and architectural elements that reflect Byzantine design. In the 15th century, after the Ottoman Empire conquered İznik, the building was converted into a mosque. Over the years, it has undergone various restorations and remains a significant cultural and historical site, showcasing the rich heritage of both Christianity and Islam.