Lewis & Short

Fīdēnae, ārum (sing. Fīdēna, ae, Sil. 15, 91; Tac. A. 4, 62. Fĭdēna with the

  1. I. i short, Verg. A. 6, 773), f., a very ancient town of Latium, on the left bank of the Tiber, five miles from Rome, now Castel Giubileo, Liv. 1, 27; 2, 19; 4, 17; 22; 33 sq.; Cic. Agr. 2, 35, 96; id. Phil. 9, 1, 4; Suet. Tib. 40; id. Calig. 31; Tac. H. 3, 79; Prop. 4 (5), 1, 36; Hor. Ep. 1, 11, 8; Juv. 6, 57 al.; cf. Bormann, Alt-Latin. Chorographie, p. 239 sq.
  2. II. Deriv.: Fīdēnas, ātis, adj., of or belonging to Fidenae: ager, Plin. 3, 5, 9, § 54: bellum, Liv. 1, 15.
    As a surname: L. Sergius Fidenas, Liv. 4, 17; 25.
    In plur. subst.: Fīdēnātes, ium, m., the inhabitants of Fidenae, Fidenates, Liv. 1, 15; 4, 17 sq.