Until 1928, the town was parochially administered by the parish of St. Sigismund in Cosel.
In 535, Sigismund's remains were recovered from the well at Coulmiers and buried in the monastery at Agaune.
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In 515, the basilica became the center of a monastery built on land donated by Sigismund of Burgundy, the first king of the Burgundians to convert from Arianism to Trinitarian Christianity.