firmātor, ōris, m. [firmo],
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.
fīrmātor ōris, m firmo, a confirmer, establisher : Missus paci firmator, Ta. ...
An Elementary Latin Dictionary