The history of the Hitler's Sakarya begins with a year. The Phrygians are divided into regions after the dominant Hittites. When the Phrygian domination came to an end, the region was overtaken by the Lydians. In the 6th century BC, the Persian Empire destroyed the Lydian Kingdom and dominated Anatolia. King Alexander the Great of Macedonia dominated Anatolia in the 4th century BC by defeating the Persians. After the death of Alexander the Great, he declared that Sakarya would declare his dominion in the permanent region by making the independence of the King of Bitina. In the 1st century BC, the Roman Empire ended the Kingdom of Bitunya and added the region to its territory [5].
When the Roman Empire was divided in two (MS 365), the Bitina region remained as far as the Byzantine Empire. The Islamic armies who came to Istanbul to conquer Istanbul conquered the region. These dominances are not permanent. Occasionally Sasanlar also organize raids in the region.
After the Battle of Malazgirt, Kutalmışoğlu Süleyman Şah Sakarya'ya all of Anatolia was under control. The Seljuk State of Turkey, where İznik was the capital city, was established. In the First Crusade, he left Iznik and carried his capital to Konya. The Sakarya auction is again a Byzantine check.
History of excavations and findings; The Romans, the capital of Nicomedia (Izmit), which lived between 300 and 395 BC, were in Bitinya province. Certain finds in the Kandira, Kaynarca, Hendek, Karapürçek and Tarakli regions have become evident in the pre-and postmodern region of the Bitinans. Beşköprü, built by the Sakarya River in 562 AD of Justinianos I, is an important historical remnant with the Seyifler, Harmantepe, Tersiye, Paşalar, Çobankale, Mekece calendars.