Would it any point in history be possible to develop a state built entirely on Plato's ideas as outlined in "The Republic"? What manner of bizarrely idealistic ruler would attempt to create a state built on the tripartite philosopher/warrior/worker division, the absence of family life, and so on? Preferable if it happens before the development of modern ideologies. The state in question need not (and might not be capable of) lasting for more than a generation, but should at least have enough staying power to affect the world for a while.