ergastularius
From LSJ
Ἐξ ἡδονῆς γὰρ φύεται τὸ δυστυχεῖν → Nempe est voluptas mater infortunii → Denn aus der Lust erwächst des Unheils Missgeschick
Latin > English (Lewis & Short)
ergastŭlārĭus: a, um, adj. ergastulum,
I of or belonging to a workhouse or house of correction (late Lat.).
I Adj.: servus, Amm. 14, 11 fin.—Also: in tenebris ergastularibus, Sid. Ep. 7, 9.—
II Subst.: ergastularii, ōrum, m. (sc. servi), overseers of a penitentiary, Col. 1, 8, 17.
Latin > French (Gaffiot 2016)
ergastŭlārĭus, ĭī, m. geôlier d’une prison d’esclaves : Col. Rust. 1, 8, 17.