Nicaea was founded in the 4th century BC by the Macedonian king Antigonus I Monophthalmus and became an important cultural, trade, and religious center in the ancient world. In 325 AD, the First Council of Nicaea was held in the city, which led to the creation of the Nicene Creed, one of the most important statements of Christian faith. Today, visitors to Nicaea can explore the ruins of the ancient city, including the city walls, gates, and several churches, as well as the remains of the council building where the Nicene Creed was created. Nicaea is also known for its beautiful ceramics and tiles, which are sold throughout Turkey.