Marie Thérèse Hélène Catherine de Montmorency de Luxembourg

Hélène, Duchesse Douairière de Sully (Marie Thérèse Hélène Catherine de Montmorency de Luxembourg; 17th June 1719 - present) was the consort of the Maison de Béthune from 1733 to 1747 as wife of the Duc de Sully. Upon the death of the Duc, she was left as a widow and regent of the Sully estate until 1749.