(anc. geog.); the capital of the Ilergaones, in Tarraconensis, or the Hither Spain: a municipium and colony; surnamed Julia Ilergavonia (Coin.) Derventio, Dertigiani, the people. Now Tortosa, in Catalonia, Dervis, on the Ebro. E. Long. 15°. N. Lat. 40° 45'.