Question: What title did the mother of Archduke Charles, Duke of Teschen hold in Tuscany?
Related documents: [0]  [DOC] Archduke Charles of Austria, Duke of Teschen (German: Erzherzog Carl Ludwig Johann Joseph Laurentius von Österreich, Herzog von Teschen; 5 September 1771 – 30 April 1847) was an Austrian field-marshal, the third son of Emperor Leopold II and his wife, Maria Luisa of Spain. He was also the younger brother of Francis II, Holy Roman Emperor. Despite being epileptic, Charles achieved respect both as a commander and as a reformer of the Austrian army. He was considered one of Napoleon's most formidable opponents. [END] 
[1]  [DOC] Infanta Maria Luisa of Spain (Spanish: "María Luisa", German: "Maria Ludovika") (24 November 1745 – 15 May 1792) was Holy Roman Empress, German Queen, Queen of Hungary and Bohemia, Grand Duchess of Tuscany as the spouse of Leopold II, Holy Roman Emperor. [END] 
Answer: 
Grand Duchess
Grand Duchess