The Bithyni were a Thracian

Thracians

The ancient Thracians were a group of Indo-European tribes inhabiting areas including Thrace in Southeastern Europe. They spoke the Thracian language – a scarcely attested branch of the Indo-European language family...

 tribe who, along with the Thyni

Thyni

The Thyni were a Thracian tribe who, along with the Bithyni, migrated to the lands that would later be known as Thynia and Bithynia in Anatolia. Each respective region got its name, presumably, from the Thracian tribe that was more prominent in the area....

, migrated to Bithynia

Bithynia

Bithynia was an ancient region, kingdom and Roman province in the northwest of Asia Minor, adjoining the Propontis, the Thracian Bosporus and the Euxine .-Description:...

 in Anatolia

Anatolia

Anatolia is a geographic and historical term denoting the westernmost protrusion of Asia, comprising the majority of the Republic of Turkey...

 - a region which they gave their name to. Herodotus

Herodotus

Herodotus was an ancient Greek historian who was born in Halicarnassus, Caria and lived in the 5th century BC . He has been called the "Father of History", and was the first historian known to collect his materials systematically, test their accuracy to a certain extent and arrange them in a...

, Xenophon

Xenophon

Xenophon , son of Gryllus, of the deme Erchia of Athens, also known as Xenophon of Athens, was a Greek historian, soldier, mercenary, philosopher and a contemporary and admirer of Socrates...

 and Strabo

Strabo

Strabo, also written Strabon was a Greek historian, geographer and philosopher.-Life:Strabo was born to an affluent family from Amaseia in Pontus , a city which he said was situated the approximate equivalent of 75 km from the Black Sea...

 all assert that the Bithyni and Thyni settled together in what would be known as Bithynia and Thynia

Thynia

In the ancient world, Thynia was a region of Asia Minor part of or equal to Bithynia which means "Both-Thynias". It was occupied by the Thyni, a Thracian people who came from Thrace. Note that in the Middle Ages, Mesothynia was the peninsula of modern Kocaeli.Its name came from Thyneas son of...

. According to Herodotus, the Bithynian Thracians originally lived along the Strymon river, and were known as Strymonians.