The date on which it became a chapter of canons is uncertain. Historians deny Brunon de Dabo-Egisheim, future Pope Leo IX, was a young monk and great provost here, but his family played a great role in the elevated status of this religious place, giving their blazon after the first crusades. Canons who subsequently held the rank of provost or dean came from very rich and noble families, among those Giovanni de Medici and several princes coming from the ducal House of Lorraine. Among the extensive privileges enjoyed by them was that of coining money; the Duchy of Lorraine was the last to hold this privilege in 1601.