Nica Rothschild was a baroness through her marriage to Jules de Koenigswarter, French ambassador to the U.S. and Canada.
She became friends with Monk during a European tour, and eventually became not only his patron but his muse.
There is a cool doc out called the Jazz Baroness by her great-niece Hannah Rothschild.
This is a great quote from Monk about his relationship with Nica(and a word of wisdom for those in a similar situation).
“Be sure that you want to have her for a girl or have her for a friend, because if you make love to a girl she ain’t gonna be your friend. Because you can have a friend, like Nica’s my friend, and I wouldn’t touch her. She’s the best friend I ever had.”
I Be Music 