Were the post stations created all at once or did they evolve?
It's just occurred to me that I don't know the history of horse travel before Edo - were post stations an old concept that got a big bump? Were they regularly positioned before Edo or were new travelers just lucky enough to find one along a new path?
Was it 'mail' that created the system or did messaging just make use of what was already partially there? Sorry for the flood of questions - I'm designing a game that includes travel in many ancient eras and would rather ask historians than AI!