KingThe fairer sex, as you'll have noticed, comprises its own list. (Think wives of the eldest sons of the younger sons of peers.) Check out this hummer of heraldic code:
If the daughter of a Peer marries a Peer she takes her husband's rank, but if she marries the eldest or younger son of a Peer she ranks either according to her own inherent precedence (i.e., as the daughter of her father), or according to that of her husband (i.e., as the wife of the eldest or younger son of a Duke, Marquess, Earl, etc), whichever happens to be the higher, no matter what the courtesy title may be.I must confess, I've read that at least three times, and I'm still not exactly certain what they're driving at. I'm grateful the Americans overthrew the British back in the 18th century. Otherwise, I probably would have been beheaded for addressing a Knight of the Garter before a Marquess.
Kidd, Charles, ed. Debrett's Peerage and Baronetage. Richmond, Surrey: Debrett's Limited, 2007. P. 29-30. Print.