Pionia (Ancient Greek: Πιονία) or Pioniai (Πιονίαι) was a town in the interior of ancient Mysia, on the river Satnioeis, to the northwest of Antandrus, and to the northeast of Gargara. Under the Roman dominion it belonged to the jurisdiction of Adramyttium, and in the ecclesiastical notices it appears as a bishopric of the Hellespontine province. No longer the seat of a residential bishop, it remains a titular see of the Roman Catholic Church.
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