Chatelaine

Someone who governs or keeps a castle.

"They looked at him a hard bunch. Of Mrs Pulteney-Banks he could see little but a cocoon of shawls, but Lady Widdrington was right out in the open, and Lancelot did not like her appearance. The chatelaine of Widdrington Manor was one of those agate-eyed, purposeful, tweed-clad women of whom rural England seems to have a monopoly. She was not unlike what he imagined Queen Elizabeth must have been in her day. A determined and vicious specimen. He marvelled that even a mutual affection for cats could have drawn his gentle uncle to such a one."

P. G. Wodehouse, Mulliner Nights (1933).