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Claustra Alpium Iuliarum

Claustra Alpium Iuliarum is a late Roman defensive system in western slovenia, northwestern Croatia, and northeastern italy. The term Claustra Alpium Iuliarum was first found in the texts of the Roman officer and historian Ammianus Marcelinus, who wrote in the fourth century a.d., and it was frequently used by many other ancient writers. The name Julian Alps was used in ancient times for the mountainous ridge extending from the Gail River valley (Carynthia in southern Austria) in the north to the mountain of Ucka (Istria in northwestern Croatia) in the south. Today, the name Claustra Alpium Iuliarum is normally applied to the remains of partially explored walls and fortifications in this region.