Tricornium (Latin for "three-horned fortification"), modern Ritopek, had an important military camp "Castra Tricornia". The name originated from three distinctive hills dominating the landscape, one of which sank or was simply washed away into the Danube later. The settlement gave name to the Romanized Thracio-Celtic tribe of Tricornenses. A 258 AD ceremonial breast plate with stylistic illustrations belonging to Legio VII Claudia soldier Aurelius Herculanus has been found and many other artifacts of the Roman period such as silver coins that were washed ashore once the dam of the Iron Gate I Hydroelectric Power Station was constructed.