Nicea, known today as İznik, is a historic city in northwestern Turkey. It was significant in ancient times and is best known for hosting the First Council of Nicaea in 325 AD, which was a pivotal event in early Christianity. The council aimed to address various theological disputes, particularly the nature of Jesus Christ and his relationship to God. The city is also famous for its beautiful Lake İznik and well-preserved ancient walls. Nicea was an important center for trade and culture during the Roman and Byzantine periods. Today, it attracts visitors interested in its rich history and archaeological sites.