My main question would be about what makes a concept of state legitimate so that it has influence over territories that it does not control, and which moral arguments could claim this legitimacy. And last but not least: - What was, or rather, what is the Roman Empire? — Gus Lamarch
I doubt we of the West will ever get over the Roman Empire. We've always looked back to it, and I think we always will. Perhaps if Alexander had lived longer, or his successors weren't so intent on fighting each other, that
potential fusion of disparate nations, peoples, cultures and beliefs would have dominated West and East. As it is, Hellenistic culture was influential throughout the Mediterranean Sea and beyond.
Rome succeeded where Alexander and his successors failed. It conquered the lands assumed by his generals and more (to the West), but more importantly it lasted, for centuries in the West and more centuries in the East. The Eastern Empire was Greek in language and culture, but Roman in law, administration and militarily (the language of law remained Latin). It called itself Roman long after what is traditionally considered the fall of the Western Empire. So, for that matter, did the barbarian nations which took its place in the West, through Charlemagne to the rather absurdly named Holy Roman Empire. It survives still, in a sense, as a kind of ghost in the form of the One Holy Catholic and Apostolic Church.
Later empires, Spanish, French and British, imitated it; the British who ran their empire were raised on it. Even the short-lived empire of Napoleon, and Napoleon III, was influenced by it. Napoleon deserved the to be called "Emperor" (a military title, after all) more than most emperors of Rome.
Its success and lasting influence can be attributed to several things. Roads, an unmatched military for many years, tolerance for most beliefs, religions and cultures provided its
imperium was acknowledged and respected and taxes paid, its law and administration, the prosperity which accompanied the
Pax Romana, and finally, perhaps, and ultimately, its governments' association with and imposition of an exclusive, aggressive and intolerant religion and the ruthless suppression of all others.
Well, that certainly sums up the past few thousand years of the West (I joke).
Rome is still around, in a way. But I don't think the influence of a state beyond its borders is a question of legitimacy. Legitimacy maybe denied or disputed. Maybe the Latin word
imperium best describes what creates it. Authority, or perceived authority, in the creation and imposition of standards governing various aspects of our lives.