aelf
Ashen One
If you are refering to Augustus' 'emperorship': that only got institutionalized very gradually over time (and would always be subject to challenge by emperors-to-be). Octavian ruled by a less conspicuous accumulation of functions than Caesar did, taking into account 'the will of the senate' - if not legally, than de facto (something which emperors who ignored the senate would always pay the price for by being labelled a 'bad emperor' for posterity).
His formal accumulation of functions into one office was institutionalisation. It continued to evolve from there, but that doesn't mean he didn't do it. Whether the senate was paid lip-service or not is not the point. The point is that he did it, albeit learning from the mistakes of his predecessors.