Prusias ad Hypium

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Prusias ad Hypium was a city in the late Roman province of Honorias and a bishopric that was a suffragan of Claudiopolis in Honoriade. It was near present-day Düzce, Turkey.


Memnon of Heraclea says that King Prusias I of Bithynia (237-192 B.C.) captured from the Heracleans the town of Kieros, united it to his dominions and changed its name to Prusias.[1] Pliny[2] and Ptolemy[3] merely mention it, one below Mt. Hypius, the other near the River Hypius or Milan-Sou.


Several of its bishops are known:

  • George (not Hesychius, as Le Quien says), 325;
  • Olympus in 451;
  • Dometius in 681;
  • Theophilus in 787;
  • Constantine in 869;
  • Leo in 879;
  • St. Paul, martyred by the iconoclasts in the ninth century.[4]

It is not known when this see disappeared; it still existed in the tenth century.[5]


  1. ^ "Frag. histor. Graec.", coll. Didot, frag. 27 and 47; fragment 41 treats of Kios/Cius or Guemlek, also called Prusias, and not of Kieros, as the copyist has written; this has given rise to numerous confusions.
  2. ^ Hist. nat., V, 43.
  3. ^ V, i, 13.
  4. ^ Le Quien, Oriens christianus I, 579.
  5. ^ Heinrich Gelzer, Ungedruckte ... Texte der Notitiæ episcopatuum, 554.
  •  This article incorporates text from a publication now in the public domainHerbermann, Charles, ed. (1913). "Prusias ad Hypium" . Catholic Encyclopedia. New York: Robert Appleton. The entry cites:
    • DE HELL, Voyage en Turquie et Perse, IV, 334-38, 353-73;
    • TEXIER, Asie Mineure, 85;
    • LE BAR, Voyage archéologique, 1174–82;
    • PERROT, Expédition archéologique de la Galatie et de la Bithynie (Paris, 1872, 20-42).