It's called male primogeniture, and it is an absolute contradiction of that basic principle of chivalrous behaviour of "ladies first".

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Some analysts believe the company is doing what it is already compelled to do by law and is spinning it as a chivalrous gesture.

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Gentlemen are chivalrous, to be chivalrous is to be a gentleman.

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Quibbles aside, who could find fault with these chivalrous folk?

NEWYORKER: Theatre on Film

Gentlemen of old, those chivalrous knights, would quite happily slaughter the women and children in a town, rape their way through the captured and sell off those remaining into slavery.

FORBES: The Definition of Chivalry

But he is mysterious, has an exotic accent, is chivalrous in an old-fashioned way while also being clearly a huge flirt, has a dark past he wrestles with and is in a Twilight-Before-Twilight sexless relationship with Rogue.

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This is a very chivalrous group.

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