Düzce, the only ancient city of the Western Black Sea, survived to date. It dates back to the Hittite (Eti) civilization that reigned between 1390 and 800. Düzce and its surroundings have been known since the 15th century. Especially in the second volume of Evliya Çelebi's Seyahatname, the bit in Düzce mentions the Salt Market. We can discuss the history of Duzce in four time periods;   Old-time Bithynian Era: In this period, there was almost no Düzce. However, Prusyas (Üskübü) was present. Düzc