Duenna

'Madam, I have a secret to tell you.' Now the very word secret is enough to rouse any one's curiosity; and, giving a quick glance round to see if her duennas were on the alert, she prepared to listen, and I saw that her eye had caught sight of the letter.

Source: wiktionary

Then he placed her in a house and shut her up in a chamber, appointing ten old women as duennas to guard her, and forbade her to go forth to the Seven Palaces.

Source: wiktionary

I dared not do anything to spoil the image of me she had set up to adore. I had toadied to her when she was the awesome duenna of my darling, and a groveling something still persisted in my attitude toward her.

Source: wiktionary