Lewis & Short

Vĕtŭlōnĭa, ae, f., a town of Etruria, Sil. 8, 485.
Hence,

    1. 1. Vĕtŭlōnĭi, ōrum, m., the inhabitants of Vetulonia, Plin. 2, 103, 106, § 227.
    2. 2. Vetŭlōnĭenses, ĭum, m., the inhabitants of Vetulonia, Plin. 3, 5, 8, § 52.