Tium () was an ancient settlement, also known as Filyos (), on the south coast of the Black Sea at the mouth of the river Billaeus Ancient coinage of Bithynia in present-day Turkey. Ancient writers variously assigned it to ancient Paphlagonia or Bithynia.
Apart from Tium, Latinized forms of the name are Teium, William Smith, A Dictionary of Greek and Roman Biography and Mythology, "Leocritus" Tieium and Tius, corresponding to the Greek names Τεῖον (Teion), Τιεῖον (Tieion), Τῖον (Tion) and Τῖος (Tios). William Anderson, "Late Byzantine occupation of the castle at Tios" in Anatolia Antiqua XVII (2009), pp. 265-277
Tium was part of Kingdom of Bithynia, which on the death of King Nicomedes IV in 74 BC became a Roman province. Emperor Theodosius I (379–392) incorporated it into Honorias, when he carved out this new province from portions of Bithynia and Paphlagonia and named it after his younger son Honorius. In 535, the Emperor Justinian united Honorias with Paphlagonia in a decree that expressly mentioned Tium among the cities that were affected. Novella 29 of Justinian There are coins of Tium as late as the reign of Gallienus, on which the ethnic name appears as Τιανοί, Τεῖοι, and Τειανοί.
Its site is located near Filyos (formerly Hisarönü), Anatolia.
Le Quien ( Oriens christianus, I, 575) mentions among its bishops:Michel Lequien, Oriens christianus in quatuor Patriarchatus digestus, Paris 1740, Tomus I, coll. 575-576]
This see figures in all the Notitiae episcopatuum.
Bishopric
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