firmator
From LSJ
οὕτως εἴη ἡμίν ὁ Θεός βοηθός καὶ τὸ ἱερὸν Αὐτοῦ Εὐαγγέλιον ὧδε ἐμφανισθέντα-ὁρκισθέντα → so help us God and Ηis holy Gospel the things here declared and sworn
Latin > English (Lewis & Short)
firmātor: ōris, m. firmo,
I a confirmer, establisher (post-Aug. and very rare): missus Drusus paci firmator (so acc. to Cod. Med., not pacis), Tac. A. 2, 46: disciplinae militaris, Plin. Ep. 10, 38, 1.
Latin > French (Gaffiot 2016)
firmātŏr,¹⁵ ōris, m. (firmo), celui qui affermit : Tac. Ann. 2, 46.