The extensive site, which was part of Bercharius' inheritance, was in the forest of Der; Puteolus, the monasterium in Dervo became Montier-en-Der, which name also came to be applied to the commune that grew up around this important abbey.
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In Montier-en-Der, Rogation Day processions were said to be events where miracles occurred.
Among its celebrated abbeys the diocese counted those of St. Memmius, founded in the fifth century by Alpinus; Toussaints, founded in the eleventh century; Montier-en-Der, founded in the seventh century by St. Bereharius, a monk from Luxeuil; Saint-Pierre au Mont, founded during the same period.