Countess Marie Larisch von Moennich

Countess Marie Louise Larisch von Moennich (also known as Countess Marie Louise Larisch-Wallersee and Countess Marie Larisch) (24 February 1858 – 4 July 1940) was a niece of, and lady-in-waiting to, her aunt Empress Elisabeth of Austria, and a morganatic descendant of the Dukes in Bavaria, a collateral branch of the House of Wittelsbach. She was implicated in the Mayerling Incident which resulted in the death of her married cousin Crown Prince Rudolf and his mistress Baroness Mary Vetsera, who was also her friend.

Source: Wikipedia — Countess Marie Larisch von Moennich (CC BY-SA 4.0)