Bithynia (;
Koine Greek: , ''Bithynía'') was an ancient
region, kingdom and
Roman province in the northwest of
Asia Minor (present-day
Turkey), adjoining the
Sea of Marmara, the
Bosporus, and the
Black Sea. It bordered
Mysia to the southwest,
Paphlagonia to the northeast along the
Pontic
Pontic, from the Greek ''pontos'' (, ), or "sea", may refer to:
The Black Sea Places
* The Pontic colonies, on its northern shores
* Pontus (region), a region on its southern shores
* The Pontic–Caspian steppe, steppelands stretching from n ...
coast, and
Phrygia
In classical antiquity, Phrygia ( ; grc, Φρυγία, ''Phrygía'' ) was a kingdom in the west central part of Anatolia, in what is now Asian Turkey, centered on the Sangarios River. After its conquest, it became a region of the great empires ...
to the southeast towards the interior of Asia Minor.
Bithynia was an independent kingdom from the 4th century BC. Its capital
Nicomedia was rebuilt on the site of ancient
Astacus in 264 BC by
Nicomedes I of Bithynia. Bithynia was bequeathed to the
Roman Republic in 74 BC, and became united with the Pontus region as the province of
Bithynia et Pontus. In the 7th century it was incorporated into the Byzantine
Opsikion theme.
It became a border region to the
Seljuk Empire in the 13th century, and was eventually conquered by the
Ottoman Turks
The Ottoman Turks ( tr, Osmanlı Türkleri), were the Turkic founding and sociopolitically the most dominant ethnic group of the Ottoman Empire ( 1299/1302–1922).
Reliable information about the early history of Ottoman Turks remains scarce, ...
between 1325 and 1333.
Description
Several major cities sat on the fertile shores of the Propontis (which is now known as
Sea of Marmara):
Nicomedia,
Chalcedon,
Cius and
Apamea. Bithynia also contained
Nicaea, noted for being the birthplace of the
Nicene Creed
The original Nicene Creed (; grc-gre, Σύμβολον τῆς Νικαίας; la, Symbolum Nicaenum) was first adopted at the First Council of Nicaea in 325. In 381, it was amended at the First Council of Constantinople. The amended form is a ...
.
According to
Strabo
Strabo''Strabo'' (meaning "squinty", as in strabismus) was a term employed by the Romans for anyone whose eyes were distorted or deformed. The father of Pompey was called "Pompeius Strabo". A native of Sicily so clear-sighted that he could see ...
, Bithynia was bounded on the east by the river Sangarius (modern
Sakarya river
The Sakarya (Sakara River, tr, Sakarya Irmağı; gr, Σαγγάριος, translit=Sangarios; Latin: ''Sangarius'') is the third longest river in Turkey. It runs through the region known in ancient times as Phrygia. It was considered one of th ...
), 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
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...
and on the south it adjoined
Phrygia
In classical antiquity, Phrygia ( ; grc, Φρυγία, ''Phrygía'' ) was a kingdom in the west central part of Anatolia, in what is now Asian Turkey, centered on the Sangarios River. After its conquest, it became a region of the great empires ...
and
Galatia
Galatia (; grc, Γαλατία, ''Galatía'', "Gaul") was an ancient area in the highlands of central Anatolia, roughly corresponding to the provinces of Ankara and Eskişehir, in modern Turkey. Galatia was named after the Gauls from Thrace (c ...
.
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
Bursa
( grc-gre, Προῦσα, Proûsa, Latin: Prusa, ota, بورسه, Arabic:بورصة) is a city in northwestern Turkey and the administrative center of Bursa Province. The fourth-most populous city in Turkey and second-most populous in the ...
and is clearly visible as far away as
Istanbul (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 Sakarya may refer to:
Places
* Sakarya Province, in Turkey
** Sakarya (electoral district)
** Sakarya University
* Sakarya (continent), a small continent 90 million years ago
* Sakarya River, in Turkey
* Sakarya, Polatlı, a village in Ankara Pro ...
to
Paphlagonia. Both of these ranges are part of the border of mountains which bound the great tableland of
Anatolia,
Turkey. The broad tract which projects towards the west as far as the shores of the Bosporus, though hilly and covered with forests — the
Turkish
Turkish may refer to:
*a Turkic language spoken by the Turks
* of or about Turkey
** Turkish language
*** Turkish alphabet
** Turkish people, a Turkic ethnic group and nation
*** Turkish citizen, a citizen of Turkey
*** Turkish communities and mi ...
''Ağaç Denizi'', or "The sea of Trees" — is not traversed by any mountain chain. The west coast is indented by two deep inlets, the northernmost, the
Gulf of İzmit (ancient Gulf of Astacus), penetrating between 40 and 50 miles (65–80 km) into the interior as far as
İzmit (ancient
Nicomedia), separated by an
isthmus of only about 25 miles (40 km) from the
Black Sea; and the
Gulf of Mudanya 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
Nicaea.
The principal rivers are the
Sangarios which traverses the province from down to north; the
Rhyndacus, which separated it from Mysia; and the
Billaeus (Filyos), which rises in the Aladağ, about 50 miles (80 km) from the sea, and after flowing by modern
Bolu (ancient Bithynion-Claudiopolis) falls into the Euxine, close to the ruins of the ancient
Tium, about 40 miles (64 km) northeast of
Heraclea Pontica (the modern
Karadeniz Ereğli), having a course of more than 100 miles (160 km). The Parthenius (modern
Bartın
Bartın is a city in northern Turkey and the central district of the province of Bartın.
Formerly a district of Zonguldak Province, Bartın was made into a province seat in 1991 with the constitution of its province, including four districts: ...
), 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.
History
Iron Age
Bithynia is named for the
Thracian tribe of the ''
Bithyni'', mentioned by
Herodotus (VII.75) alongside the ''
Thyni''. The "
Thraco-Phrygian
The Thracian language () is an extinct and poorly attested language, spoken in ancient times in Southeast Europe by the Thracians. The linguistic affinities of the Thracian language are poorly understood, but it is generally agreed that it was ...
" migration from the Balkans to Asia Minor would have taken place at some point following the
Bronze Age collapse or during the early Iron Age. 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 the Thyni and Bithyni as settling side by side. No trace of their original language has been preserved, but Herodotus describes them as related to the tribes of Thracian extraction like the
Phrygians
The Phrygians (Greek: Φρύγες, ''Phruges'' or ''Phryges'') were an ancient Indo-European speaking people, who inhabited central-western Anatolia (modern-day Turkey) in antiquity. They were related to the Greeks.
Ancient Greek authors used ...
and
Armenians, whose languages may form part of the
Paleo-Balkan group (although this is not certain and the theory is not universally accepted).
Later the
Greeks established on the coast the colonies of Cius (modern Gemlik);
Chalcedon (modern
Kadıköy), at the entrance of the Bosporus, nearly opposite
Byzantium
Byzantium () or Byzantion ( grc, Βυζάντιον) was an ancient Greek city in classical antiquity that became known as Constantinople in late antiquity and Istanbul today. The Greek name ''Byzantion'' and its Latinization ''Byzantium'' cont ...
(modern
Istanbul) and
Heraclea Pontica (modern Karadeniz Ereğli), on the Euxine, about 120 miles (190 km) east of the Bosporus.
The Bithynians were incorporated by king
Croesus
Croesus ( ; Lydian: ; Phrygian: ; grc, Κροισος, Kroisos; Latin: ; reigned: c. 585 – c. 546 BC) was the king of Lydia, who reigned from 585 BC until his defeat by the Persian king Cyrus the Great in 547 or 546 BC.
Croesus was ...
within the
Lydia
Lydia (Lydian language, Lydian: 𐤮𐤱𐤠𐤭𐤣𐤠, ''Śfarda''; Aramaic: ''Lydia''; el, Λυδία, ''Lȳdíā''; tr, Lidya) was an Iron Age Monarchy, kingdom of western Asia Minor located generally east of ancient Ionia in the mod ...
n monarchy, with which they fell under the dominion of
Persia (546 BC), and were included in the
satrapy of
Phrygia
In classical antiquity, Phrygia ( ; grc, Φρυγία, ''Phrygía'' ) was a kingdom in the west central part of Anatolia, in what is now Asian Turkey, centered on the Sangarios River. After its conquest, it became a region of the great empires ...
, which comprised all the countries up to the Hellespont and Bosporus.
Kingdom of Bithynia
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
''Basileus'' ( el, ) is a Greek term and title that has signified various types of monarchs in history. In the English-speaking world it is perhaps most widely understood to mean "monarch", referring to either a "king" or an "emperor" and al ...
'') in 297 BC.
His son and successor,
Nicomedes I, founded
Nicomedia, which soon rose to great prosperity, and during his long reign ( BC), as well as those of his successors,
Prusias I,
Prusias II and
Nicomedes II (14991 BC), the
kingdom of Bithynia had a considerable standing and influence among the minor monarchies of
Anatolia. But the last king,
Nicomedes IV, was unable to maintain himself in power against
Mithridates VI of Pontus
Mithridates or Mithradates VI Eupator ( grc-gre, Μιθραδάτης; 135–63 BC) was ruler of the Kingdom of Pontus in northern Anatolia from 120 to 63 BC, and one of the Roman Republic's most formidable and determined opponents. He was an e ...
. After being restored to his throne by the
Roman Senate, he bequeathed his kingdom through his 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 changed frequently. During this period, Bithynia was commonly united for administrative purposes with the province of
Pontus. This was the situation at the time of Emperor
Trajan, when
Pliny the Younger
Gaius Plinius Caecilius Secundus, born Gaius Caecilius or Gaius Caecilius Cilo (61 – c. 113), better known as Pliny the Younger (), was a lawyer, author, and magistrate of Ancient Rome. Pliny's uncle, Pliny the Elder, helped raise and educate ...
was appointed governor of the combined provinces (109/110111/112), a circumstance which has provided historians with valuable information concerning the Roman provincial administration at that time.
Byzantine province

Under the
Byzantine Empire, Bithynia was again divided into two provinces, separated by the
Sangarius. Only the area to the west of the river retained the name of Bithynia.
Bithynia attracted much attention because of its roads and its strategic position between the frontiers of the
Danube in the north and the
Euphrates
The Euphrates () is the longest and one of the most historically important rivers of Western Asia. Tigris–Euphrates river system, Together with the Tigris, it is one of the two defining rivers of Mesopotamia ( ''the land between the rivers'') ...
in the south-east. To secure communications with the
eastern provinces, the monumental
bridge across the river Sangarius was constructed around 562 AD. Troops frequently wintered at Nicomedia.
During this time, the most important cities in Bithynia were
Nicomedia, founded by Nicomedes, and
Nicaea. The two had a long rivalry with each other over which city held the rank of capital.
Notable people
*
Hipparchus of Nicaea (2nd century BC), Greek astronomer, discovered precession and discovered how to predict the timing of eclipses
*
Theodosius of Bithynia (2nd century BC), Greek astronomer and mathematician
*
Asclepiades of Bithynia
Asclepiades ( el, Ἀσκληπιάδης; c. 129/124 BC – 40 BC), sometimes called Asclepiades of Bithynia or Asclepiades of Prusa, was a Greek physician born at Prusias-on-Sea in Bithynia in Anatolia and who flourished at Rome, where he pr ...
(c. 169 BC – c. 100 BC), Greek physician
*
Antinous
Antinous, also called Antinoös, (; grc-gre, Ἀντίνοος; 27 November – before 30 October 130) was a Greek youth from Bithynia and a favourite and probable lover of the Roman emperor Hadrian. Following his premature death before his ...
(2nd century),
Catamite of the
Roman Emperor Hadrian
Hadrian (; la, Caesar Trâiānus Hadriānus ; 24 January 76 – 10 July 138) was Roman emperor from 117 to 138. He was born in Italica (close to modern Santiponce in Spain), a Roman ''municipium'' founded by Italic settlers in Hispania B ...
*
Cassius Dio (c. 155 - c. 235), Roman historian,
senator
A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
, and
consul
*
Arrian
Arrian of Nicomedia (; Greek: ''Arrianos''; la, Lucius Flavius Arrianus; )
was a Greek historian, public servant, military commander and philosopher of the Roman period.
''The Anabasis of Alexander'' by Arrian is considered the best ...
(Lucius Flavius Arrianus), Greek historian, c. 86-160
*
Helena
Helena may refer to:
People
*Helena (given name), a given name (including a list of people and characters with the name)
*Katri Helena (born 1945), Finnish singer
*Helena, mother of Constantine I
Places
Greece
* Helena (island)
Guyana
* ...
, mother of
Constantine the Great
Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to Constantine the Great and Christianity, convert to Christiani ...
*
Phrynichus Arabius (2nd century), grammarian
*
Auxentius of Bithynia (c. 400 - 473), hermit
*
Hypatius of Bithynia (died c. 450), hermit
*
Vendemianus of Bithynia Vendemianus the Hermit of Bithynia was a solitary monk of the early sixth century.
Vendemianus (Bendemianus) was a disciple of St. Auxentius and became known for his holiness of life and gift of healing. He dwelt for more than forty years on a m ...
(6th century), hermit
See also
*
Bithynian coinage
Bithynian coinage refers to coinage struck by the Kingdom of Bithynia that was situated on the coast of the Black Sea.
Extent of monetization
Asia Minor is known for having kingdoms that issued abundant coinage during some points in their history. ...
*
Asia Minor Slavs
*
Ancient regions of Anatolia
References
*
Further reading
;Hellenistic
*
*
*
;Roman
*
*
*
*
*
{{coord, 40.5, 31.0, dim:200km, display=title
Historical regions of Anatolia
Praetorian prefecture of the East
Provinces of the Byzantine Empire
History of Bursa Province
History of Kocaeli Province
History of Sakarya Province
History of Bilecik Province
History of Düzce Province
History of Yalova Province
History of Bolu Province
History of Kastamonu Province
History of Bartın Province
History of Zonguldak Province
States and territories established in the 3rd century BC
297 BC
290s BC establishments
States and territories disestablished in the 1st century BC