One of twins, she was the youngest of six children of the eighth marquess of Queensberry.

Prince William, the heir to the throne, will be there along with his wife, Catherine, Princess of Wales, and their children, as well as marquesses, dukes, baronesses, lords and earls.

A duke is the highest ranking member of the English nobility, followed by marquesses, earls, viscounts and barons.

His sister Sybil, who married a marquess and restored the palatial Houghton Hall in Norfolk, sat several times for John Singer Sargent, drenched in silk that resembles whipped butter.

“Yes! From Haiti, he sailed to Paris. His father was a marquess. That’s just below a duke,” she adds, turning toward Zion.