A three year margin not enough?
Well, we can discount 102 BC, as he was using the new-model army by then. So a two year margin.
Now, Marius was a pretty sensible chap, so he'd have wanted to give his men plenty of training, so 103 BC is probably out as the beginning of his reforms.
Which leaves 104 BC, when he took the Consulship, and therefore command of the army.
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