I assumed when somebody said, "building a capital in a swamp on one end of a great empire" they were talking about Washington, DC, but I guess that's just my American provincialism showing through. Still, it's kind of a funny coincidence how often that happens, that we've got more than one example.
I thought about bringing up the Sinking of the White Ship, and the resulting Anarchy, but it's not all that weird; you pilot a ship drunk as a lord, these things happen. And the English have had so many civil wars that the subject has it's own Wikipedia page.
Really, if you want to talk about ASB, the fact that a majority of the population of this planet speaks the language of a tiny insignificant island seems a wee bit suspiciously ASB to me. I mean, can you imagine Malay or Papua New Guinean being as downright ubiquitous as English?
If you think that the entirety of the Western civilization is heir to what once was a village hidden amid the swamps of Latium, it’s not really that ASB.