The Roman Empire
Five centuries of the principate: how the empire was governed, why it held together for so long, and what actually ended in the west.
The system Augustus left
A monarchy assembled entirely out of republican offices, described in republican language, with no name, no founding law, and no rule for what happened when its holder died.
Making an emperor
A position with no rule of succession had to be filled somehow, and the improvisations that filled it show exactly who was deciding.
The army that made them
A quarter of a million professional soldiers on fixed terms, stationed where the emperor could reach them and nowhere near Italy, was the empire's largest institution and its only universal one.
What the empire cost
A coinage, a census and a handful of taxes had to produce the army's wages every year, and the arithmetic explains both why the burden was light and why there was no margin.