So-- Barrayar goes from rule under Emperor Ezar (who's pretty much an absolute monarch; while he's not as much of an autocrat as, say, Mad Emperor Yuri, or even Dorca the Just, the canon is still pretty clear that whatever he says goes) directly to the Vorkosigan Regency, and thence to Emperor Gregor.
If I remember the canon right, there's only about seventeen years between Ezar's death and Gregor's ascendancy. And that's on top of the fact that, even at the time that Diplomatic Immunity is set, it's only been less than a century since the end of the Time of Isolation.
So, before I write my next entry, tell me, Bujold readers-- am I missing anything? Is there anything I've gotten wrong here?