Castra ad Fluvium Frigidum is a Late-Roman fortress located in Ajdovščina, Slovenia, in the Vipava Valley. Built in the early 270s as part of the Claustra Alpium Iuliarum defensive system, it played a peripheral role in the Battle of Frigidus in 394.
File:Castra Ad Fluvium Frigidum 1756.JPG
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