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The former French Catholic Diocese of Noyon lay in the north-east of France, around Noyon. It was formed when Saint Medardus moved the seat of the bishopric at Vermandois to Noyon, in the sixth century. From 545 to 1146, it was united with the bishopric of Tournai as the Diocese of Noyon–Tournai. Then in the twelfth century it was again independent, and the bishop of Noyon became a pairie-comté of France.
The diocese of Noyon was brought to an end by the French Revolution. Its territory passed to the diocese of Beauvais.