I've been reading about Roman political system in the late Roman Republic directly prior to Caesar being declared dictator. A question occurred to me which I cannot seem to find an answer to.
What legal structures survived the transition from republic to empire and which ones were disposed of by Augustus and his successors?
I'm aware that the senate remained (although I'd appreciate details on exactly which of its powers were curtailed). But I cannot seem to find information on which ministries persisted or whether the college of Pontiffs retained any power, and why they lost at least some of their influence.