Tius

Tius /ˈtaɪəs/ was an ancient settlement on the southern coast of the Black Sea, in what is now Turkey; it is still the name of a Catholic titular see. The original diocese was a suffragan of Claudiopolis in Honorias; its see was also known as Tium, Tieium, Tieion, Tios or Tion (Greek: Τῖον). It corresponds to modern Filyos (Hisarönü). Modern Filyos (Filyas) stands on the ruins of ancient Tium, which included remains of ramparts and sculptures. It is not far from the mouth on the Black Sea of the Filyas River, the Billaeus in the antique period.

According to Strabo (542, 545) the town was only remarkable as the birthplace of Philetaerus, founder of the royal dynasty of Pergamus. The coins give a certain Dionysius as the founder; in fact it was the site of a temple of Dionysius and one of Jupiter. Tieion was a Greek colony of Miletus

Novel xxix of Justinian locates the town in Paphlagonia but geographically is in Bithynia. George Pachymeres (I, 312) mentions Tium among the Byzantine towns which escaped the attacks of the Seljuks in 1269.