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Ancient Region of Anatolia
Bithynia (Βιθυνία)
Location Northern Anatoliamarker
State existed: 297-74 BC
Nation Bithyni, Thyni, Greeks
Historical capitals Nicomediamarker, Nicaea
Roman province Bithynia
Bithynia was an ancient region, kingdom and Roman province in the northwest of Asia Minormarker, adjoining the Propontismarker, the Thracian Bosporusmarker and the Euxine (today Black Seamarker).


Several major cities sat on the fertile shores of the Propontis (which is now known as Sea of Marmaramarker): Nicomediamarker, Chalcedonmarker, Cius and Apamea. Bithynia also contained Nicaeamarker, noted for being the birthplace of the Nicene Creed.

According to Strabo Bithynia was bounded on the east by the river Sangarius (modern Sakarya river), but the more commonly received division extended it to the Parthenius, which separated it from Paphlagonia, thus comprising the district inhabited by the Mariandyni. On the west and southwest it was separated from Mysia by the river Rhyndacus, and on the south it adjoined Phrygia, Epictetus and Galatia.

It is occupied by mountains and forests, but has valleys and coastal districts of great fertility. The most important mountain range is the (so-called) "Mysian" Olympus (8000 ft., 2500 m), which towers above Bursamarker and is clearly visible as far away as Istanbulmarker (70 miles, 113 km). Its summits are covered with snow for a great part of the year.

East of this the range extends for more than 100 miles (160 km), from the Sakarya to Paphlagonia. Both of these ranges are part of the border of mountains which bounds the great tableland of Anatoliamarker, Turkeymarker. The broad tract which projects towards the west as far as the shores of the Bosporus, though hilly and covered with forests — the Turkishmarker Ağaç Denizi, or "The Ocean of Trees" — is not traversed by any mountain chain. The west coast is indented by two deep inlets, the northernmost, the Gulf of İzmitmarker (ancient Gulf of Astacus), penetrating between 40 and 50 miles (65-80 km) into the interior as far as İzmitmarker (ancient Nicomediamarker), separated by an isthmus of only about 25 miles (40 km) from the Black Seamarker; and the Gulf of Mudanyamarker or Gemlik (Gulf of Cius), about 25 miles (40 km) long. At its extremity is situated the small town of Gemlik (ancient Cius) at the mouth of a valley, communicating with the lake of Iznik, on which was situated Nicaeamarker.

The principal rivers are the Sakarya which traverses the province from south to north; the Rhyndacus, which separated it from Mysia; and the Billaeus (Filiyas), which rises in the Aladağ, about 50 miles (80 km) from the sea, and after flowing by modern Bolumarker (ancient Bithynion-Claudiopolis) falls into the Euxine, close to the ruins of the ancient Tium, about 40 miles (64 km) northeast of Heraclea Ponticamarker (the modern Karadeniz Ereğli), having a course of more than 100 miles (160 km). The Parthenius (modern Bartınmarker), the eastern boundary of the province, is a much less considerable stream.

The valleys towards the Black Sea abound in fruit trees of all kinds, such as oranges, while the valley of the Sangarius and the plains near Bursa and Iznik (Nicaea) are fertile and well cultivated. Extensive plantations of mulberry trees supply the silk for which Bursa has long been celebrated, and which is manufactured there on a large scale.


Photo of a 15th Century map showing Bithynia.
According to ancient authors (Herodotus, Xenophon, Strabo, etc.), the Bithynians were an immigrant Thracian tribe. The existence of a tribe called Thyni in Thrace is well established, and the two cognate tribes of the Thyni and Bithyni appear to have settled simultaneously in the adjoining parts of Asia, where they expelled or subdued the Mysians, Caucones and other minor tribes, the Mariandyni maintaining themselves in the northeast. Herodotus mentions that the tribe Thyni and Bithyni as existing side by side; but ultimately the latter must have become the more important, as they gave their name to the country. They were incorporated by king Croesus within the Lydian monarchy, with which they fell under the dominion of Persia (546 BC), and were included in the satrapy of Phrygia, which comprised all the countries up to the Hellespont and Bosporus.

Kingdom of Bithynia

But even before the conquest by Alexander the Bithynians appear to have asserted their independence, and successfully maintained it under two native princes, Bas and Zipoites, the latter of whom assumed the title of king (basileus) in 297 BC. His son and succeeder, Nicomedes I, founded Nicomediamarker, which soon rose to great prosperity, and during his long reign (c.278 – c.255 BC), as well as those of his successors, Prusias I, Prusias II and Nicomedes II (14991 BC), the kingdom of Bithynia held a considerable place among the minor monarchies of Anatoliamarker. But the last king, Nicomedes IV, was unable to maintain himself against Mithridates VI of Pontus, and, after being restored to his throne by the Roman Senate, he bequeathed his kingdom by will to the Roman republic (74 BC). The coinage of these kings show their regal portraits, which tend to be engraved in an extremely accomplished Hellenistic style.

Roman province

As a Roman province, the boundaries of Bithynia frequently varied, and it was commonly united for administrative purposes with the province of Pontus. This was the state of things in the time of Trajan, when Pliny the Younger was appointed governor of the combined provinces (109/110111/112), a circumstance to which we are indebted for valuable information concerning the Roman provincial administration.Under the Byzantine Empire Bithynia was again divided into two provinces, separated by the Sangarius, to the west of which the name of Bithynia was restricted.

Bithynia appears to have attracted so much attention because of its roads and its strategic position between the frontiers of the Danube in the north and the Euphrates in the southeast. For securing communications with the eastern provinces, the monumental Bridge across the river Sangariusmarker was constructed around 562 AD. Troops frequently wintered at Nicomedia.

The most important cities were Nicomediamarker and Nicaeamarker. The two had a long rivalry with one another over which city held the rank of capital. Both of these were founded after Alexander the Great; but at a much earlier period the Greeksmarker had established on the coast the colonies of Cius (modern Gemlik); Chalcedonmarker (modern Kadıköymarker), at the entrance of the Bosporus, nearly opposite Byzantium (modern Istanbulmarker; and Heraclea Ponticamarker (modern Karadeniz Ereğli), on the Euxine, about 120 miles (190 km) east of the Bosporus. All these rose to be flourishing places of trade, as did Prusa. Other places of importance at the present day are İzmit and Scutari (modern Üsküdarmarker).

Notable people

See also



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