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The Gregoriou Monastery (Greek: Γρηγορίου) is situated on the southwest side of the Athos Peninsula in northern Greece, between the monasteries of Dionysiou and Simonopetra. Gregoriou originally was dedicated to the St. Nicholas but later was renamed in honor of its founder, Gregory. It is ranked seventeenth in the hierarchical order of the twenty monasteries located on the Mount Athos peninsula. Gregoriou is reputed to be one of the most well-organized and strict coenobitic monasteries on the Mount Athos peninsula.

Source: http://orthodoxwiki.org/Gregoriou_Monastery_(Athos)