Marie-Adélaïde, Grand Duchess of Luxembourg

Marie-Adélaïde (Marie Adelheid Thérèse Hilda Wilhelmine; 14 June 1894 – 24 January 1924), reigned as Grand Duchess of Luxembourg from 1912 until she left the throne in 1919. 
She was the first Grand Duchess regnant of Luxembourg (after five grand dukes), its first female monarch since Duchess Maria Theresa (1740–1780, who was also Austrian Archduchess and Holy Roman Empress) and the first Luxembourgish monarch to be born within the territory since Count John the Blind (1296–1346).