We can then return to our list at the beginning:
- Cohorts: Experimented with before Marius, especially in Spain. Marius uses cohorts, but there’s no evidence he systematized or standardized this or was particularly new or unusual in doing so. Probably the actual breakpoint here is the Social War.
- Poor Volunteers Instead of Conscripted Assidui: Marius does not represent a break in the normal function of the Roman dilectus but a continuation of the Roman tradition of taking volunteers or dipping into the capite censi in a crisis. The traditional Roman conscription system functions for decades after Marius and a full professional army doesn’t emerge until Augustus.
- Discharge bonuses or land as a regular feature of Roman service: Once again, this isn’t Marius but Imperator Caesar Augustus who does this. Rewarding soldiers with loot and using conquered lands to form colonies wasn’t new and Marius doesn’t standardize it, Augustus does.
- No More equites and velites: No reason in the source to suppose Marius does this and plenty of reasons to suppose he doesn’t. Both velites and equites seem to continue at least a little bit into the first century. Fully replacing these roles with auxilia is once again a job for our man, Imperator Caesar Augustus, divi filius, pater patriae, reformer of armies, gestae of res, and all the rest.
- State-Supplied Equipment: No evidence in the sources. This shift is happening but is not associated with Marius. In any event, the conformity of imperial pay records with Polybius’ system of deductions for the second century BC suggests no major, clean break in the system.
- A New Sort of Pilum: No evidence, probably didn’t exist, made up by Plutarch or his sources. Roman pilum design is shifting, but not in the ways Plutarch suggests. If a Marian pilum did exist, the idea didn’t stick.
- Aquila Standards: Eagle standards pre-date Marius and non-eagle standards post-date him, but this may be one thing he actually does do, amplifying the importance of the eagle as the primary standard of the legion.
- The sarcina and furca and making Roman soldiers carry things: By no means new to Marius. This is a topos of Roman commanders before and after Marius. There is no reason to suppose he was unusual in this regard.
So the Marian reforms … were not a thing. Functionally none of what is described as happening in them was new or unique to Marius. Indeed, the most substantial reforms are either things that were already changing (and which Marius seems to have had little role in) or things which had not yet changed but which would, under Augustus. Indeed, one of the problems with the assumption of a Marian reform is that it takes a whole lot of changes which were more likely a package of reforms under Augustus and pulls them forward in time to Marius, doing some damage to our understanding of both figures.
But Augustus makes much more sense as the figure doing many of those organizational changes. For one we have sources actually telling us he did them, from the standardization of military service (Dio 54.25.6), the creation of retirement bonuses and the aerarium militare to fund them (Dio 54.25.6 again, but also Res Gestae 17), and the radical expansion and formalization of the auxilia as part of the Roman army (Tac. Ann. 4.5). The one thing missing is citizenship-for-service, which we can see emerging under Tiberius, the next emperor immediately after Augustus. And it makes sense because Augustus is, by necessity, doing a bunch of other things with the legions too. He’s instituting a whole new command structure, with dedicated legionary commanders (the legatus legionis) serving under his own provincial commanders (legati Augusti) with imperial procuratores handling the former role of the quaestors. Also, the legions get their citizen cavalry (though a quite small detachment of it) back too.
So instead of thinking, “Marian reforms” – which were, I must stress, not a thing – you ought to be thinking about a period of tactical, organizational and institutional change beginning in the second century, accelerating in the first century and then finally being instituted as a comprehensive set of reforms and formalization by Augustus, not by Marius, which codified a lot of change that had already happened over that long period. A long process with a punctuation mark at the end rather than a singular moment of reform associated with a singular Roman general.
Alright. Now one of you go and fix the Wikipedia entry.
Bret Devereaux, “Collections: The Marian Reforms Weren’t a Thing”, A Collection of Unmitigated Pedantry, 2023-06-30.
August 16, 2026
QotD: The “Marian reforms” were not a thing
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