Rob Yale
Rob Yale asked Lois McMaster Bujold:

Hi Lois, in A Civil Campaign, the majordomo says, “My list,” said the majordomo, “has all of you on it. Vorrutyer, Lord Vorrutyer, Lord Vorpatril, Armsman Szabo.” Isn’t Ivan supposed to be Lord Ivan?

Lois McMaster Bujold
Ivan gets his honorific not from being heir to Count Falco, but for being great-grandson of Prince Xav, and in a Certain Unstated Relationship to the camp stool. Barrayaran titles don't have as many quirky exceptions, which must be learned one by one and vary with context, to their already ad hoc rules as, say, the English language does, but there is a definite tendency in that direction.

Ta, L.

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