If from Veii the traveller follow the course of the Crémera for five or six miles, it will lead him to the Tiber, of which it is a tributary. In the cliffs of the lonely but beautiful ravine through which it flows he will observe in several places sepulchral caves, particularly at the end nearer Veii; and on reaching the mouth of the glen, he will have, on the right, the ruin-capt heights which are supposed by Nibby and Gell to have been the site of the Castle of the Fabii.

Exactly opposite the mouth of this glen, and on the other bank of the Tiber, rises the hill which was once crowned by the city of Fidenæ. This, though beyond the bounds of Etruria Proper, being on the left bank of the Tiber, was an Etruscan city, and in all probability a colony of Veii; for Livy speaks of the consanguinity of the inhabitants of the two cities. It seems at least to have been dependent on Veii, and was frequently associated with her in opposition to Rome. Its history, indeed, save that on several occasions it fell into the hands of the Romans, is almost identical with that of Veii.