Rhaetus

From LSJ

χελῶναι μακάριαι τοῦ δέρματος → you tortoises are fortunate in your skin, you blessed turtles with your shell

Source

Latin > French (Gaffiot 2016)

Rhætus, ī, m., roi gaulois qui donna son nom à la Rhétie : Plin. 3, 133.