Princess Maria Theresia of Liechtenstein was the heiress to the Silesian Duchy of Troppau. Countess of Soissons by marriage, she was the last person to hold the title. She had one son who predeceased her in 1734. Wikipedia
Born: May 11, 1694, Vienna, Austria
Died: February 20, 1772 (age 77 years), Vienna, Austria
Children: Eugene Jean, Count of Soissons
Spouse: Thomas Emmanuel, Prince of Savoy-Carignan (m. 1713–1729)