 No further constitutional reforms were enacted during the Principate. The only development of any significance was the continuing slide towards monarchy, as the constitutional distinctions that had been set up by Augustus lost whatever meaning that they still had. Starting in 235, with the reign of the barbarian Emperor Maximinus Thrax, the Empire was put through a period of severe military, civil, and economic stress. The crisis arguably reached it height during the reign of Gallienus, from 260 to 268. The crisis ended with the accession of Diocletian in 284, and the abolishment of the Principate.
