Its site is occupied by the modern town of Bolu, Asiatic Turkey.
[1][2] Strabo describes Bithynium as lying above Tius[3] and it possessed the country around Salone or Salon, which was a good feeding country for cattle, and noted for its cheese.
Bithynium was the birthplace of Antinous, the favourite of Hadrian, as Pausanius tells us,[5] who adds that Bithynium is beyond, by which he probably means east of, the river Sangarius; and he adds that the remotest ancestors of the Bithynians are Arcadians and Mantineans.
No longer a residential see, it remains a titular see of the Roman Catholic Church under the name Claudiopolis in Honoriade.
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