Gallienus

From LSJ

ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws

Source

Latin > French (Gaffiot 2016)

Gallĭēnus, ī, m., Gallien [empereur romain] || -ēnānus, a, um, de Gallien : Inscr.