Milvian Bridge battle took place october 28th of A.D. 312. very close to the southern abutment of that bridge which, saving the Tiber current, provided continuity to the Via Flaminia to the heart of the crowded streets of Rome.
Anyway, for huge relief of the residents of the Eternal City, Constantine did not trigger any repression against them, stating in his appearance before the Senate on the same day of its entry into Rome, its intention both to be lenient with those who supported Maxentius as to respect the authority of such a prestigious and ancient camera. Indeed, far from wanting to repeat the massacre of senators led by Septimius Severus, his predecessor in the list of Roman emperors who conquered the city in the context of a civil war, Constantine wanted to shore up his power in the western half of the Empire (still in question because to the eastern August Galerius eyes, Constantine was still only Caesar) turning the hostile city of Rome in an ally. The best procedure for it was to continue, somehow, the work of Maxentius with the difference of permuting the prominence of him by Constantine own. This implied the need not only to show clemency but also needed both neutralize the power could subtract the losing side as yet beyond, suppress from awareness of the Romans the idea of Maxentius as benefactor and replace it for an image of tyrant.