[German version] RM are first mentioned (in the form
ripenses) in a decision of Constantine I in AD 325 (Cod. Theod. 7,20,4), where they are distinguished from the
comitatenses , the field army.
Ripenses ranked just below the
comitatenses, but above the soldiers of the
alae and cohorts, who made up the auxiliary troops (Auxilia). They obtained exemption from the poll tax for themselves and their wives after twenty-four years' service, but were less privileged than the
comitatenses in the case of a medical discharge. It is possible that the
ripenses or RM (Cod. Theod. 7,1,18; 7,4,14) …