Francis I (Francis Stephen; 8 December 1708 – 18 August 1765) was Holy Roman Emperor and Grand Duke of Tuscany, though his wife effectively executed the real power of those positions. With his wife, Maria Theresa of Austria, he was the founder of the Habsburg-Lorraine dynasty. From 1728 until 1737 he was Duke of Lorraine, but lost Lorraine when he had to give it to France. He was the father of Marie Antoinette, the Queen of France.