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I have heard that the Theme system was effective until some disaster, but what did it actually do? What was it supposed to do?

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closed as not a real question by Tom Au, American Luke, Yannis, Steven Drennon May 9 '13 at 3:51

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

This is not even as good a question for the site than the other one. Here, we're starting from "Ground Zero." A question is supposed to give us a better "start" or "platform" than this. Coming in, you're supposed to at least know what a theme system is. Then an acceptable question would be "how dd it work?" – Tom Au May 8 '13 at 21:39
Background: The Byzantine army was divided into regional themes that perpetually guarded respective sectors of the Empire‚Äôs frontier. Combined with fortifications setup along the frontier, the theme system stymied invasion attempts by hostile neighbors. See also the Wikipedia article. – Fred May 8 '13 at 22:09