Mary is the youngest child and only daughter of James Charteris and his first wife Catherine, who is the daughter of Guinness heir Jonathan Guinness, 3rd Baron Moyne.

Source: https://www.dailymail.co.uk/tvshowbiz/article-12579759/Lucy-Hale-Caroline-Daur-Paris-Fashion-Week-Elie-Saab.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

She also had many friends from the London set, including Poppy Delevingne, who is dating Olympia's brother Prince Constantine Alexios Of Greece, Lady Mary Charteris and Isabelle Massanet, who is dating Olympia's brother Prince Achileas-Andreas.

Source: https://www.dailymail.co.uk/femail/article-12437111/Summer-isnt-Socialites-jetting-glitzy-locations-including-Ibiza-Swiss-Alps-St-Tropez-enjoy-sunshine.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

The FM said he’d asked a Scottish Government legal eagle, solicitor general Ruth Charteris KC, to find out what the hell the Scottish Government was playing at.

Source: https://www.heraldscotland.com/news/23882352.fmqs-sketch-absolutely-nothing-see/?ref=rss