The Abbey of St. Antonin was founded near Fredelacum about 960; in 1034 it passed under the jurisdiction of the Bishop of Girone and was annexed in 1060 to the Congregation of Cluny.
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The traditions of the diocese mention as its first apostle of Christianity St. Antoninus, born at Fredelacum near Pamiers, an apostle of the Rouergue, martyred in his native country (date uncertain).