When travelers think of Turkey, they often imagine Istanbul, Cappadocia, or Ephesus. Yet few realize that İznik, known in ancient times as Nicaea, played one of the most significant roles in the history of Christianity. In A.D. 325, Emperor Constantine convened the First Council of Nicaea, where approximately 318 bishops gathered to discuss the nature of Jesus Christ and establish the Nicene Creed, a profession of faith still recited today by millions of Catholics and Christians around the world. Centuries later, in A.D. 787, the city hosted the Second Council of Nicaea, which affirmed the veneration of holy icons and became a defining moment in Christian history. Beyond its religious significance, İznik is home to remarkably preserved Roman walls, the historic Hagia Sophia of İznik, the peaceful shores of Lake İznik, and the world-famous İznik ceramics that once decorated the great monuments of the Ottoman Empire. Located just two hours from Istanbul, İznik is the perfect destination for travelers interested in history, Christian heritage, and authentic Turkish culture. With ViaTurquia, you can discover this extraordinary city with an official English-speaking guide and experience one of Christianity's most important historical sites in a comfortable day trip.