Rhoas

τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies

Latin > French (Gaffiot 2016)

(2) Rhoās, ancien nom de Laodicée : Plin. 5, 105.
(3) Rhoās ou Rhoān, m., fleuve du Caucase : Plin. 6, 14.