Vesulus
From LSJ
τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
Vĕsŭlus: i, m.,
I a mountain in Liguria, now Monte Viso, Mel. 2, 4, 4; Verg. A. 10, 708; Plin. 3, 16, 20, § 117.