Carmen
Carmen asked Lois McMaster Bujold:

In Captain Vorpatril's Alliance, where Morozov explains Ivan's relation to the Barrayaran throne*camp stool--can't puzzle out why Prince Xav wasn't next in line for the throne after Emperor Yuri, rather than going over to whatever branch led to Ezar? I know in the past it's been referenced that Salic descent was important for disqualifying Miles, but isn't that related to descent thru Olivia Vorbarra etc?

Lois McMaster Bujold
Xav was a half brother of Yuri, of different mothers. He was born well before Yuri's mother died, Dorca finally married his significant other, and Xav was legitimated. So Xav's legitimacy was always a bit dodgy.

More critically, Mad Yuri had Xav's only son murdered (his daughters survived) so Xav had no successor when Yuri was brought down and they had to figure out a new emperor. He was also old and grieving and very, very tired. Piotr was in a similar state, having just lost his favored heir. The two put their heads together and decided to headhunt Ezar instead of putting too-young Aral in the hot seat.

Good question for historical speculators whether things would have gone differently if Piotr's older son had lived.

Ta, L.

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