Francis I (Francis Stephen; 8 December 1708 – 18 August 1765)[2] was Holy Roman Emperor and Grand Duke of Tuscany, though his wife effectively executed the real powers of those positions. With his wife, Maria Theresa, he was the founder of the Habsburg-Lorrainedynasty. From 1728 until 1737 he was Duke of Lorraine. In 1737, Lorraine became managed by France under terms resulting from the War of the Polish Succession. Francis and House Lorraine received the Grand Duchy of Tuscany in the peace treaty that ended that war. After taking the throne of the Holy Roman Empire, the return of the ancestral duchy of Lorraine went nominally to his brotherPrince Charles Alexander of Lorraine (who was however engaged in ruling the Austrian Netherlands), until succession under derivate house alliances resulted in Lorraine's annexation to France in 1766.[citation needed]
Francis was the father of the deposed and later executed Marie Antoinette, Queen of France.
The Maria Theresa thaler (MTT) is a silverbullion coin that has been used in world tradecontinuously since they were first minted in 1741, at that time using the then Reichsthaler standard of 9 thalers to the Vienna mark. In 1750 the thaler was debased to 10 thalers to the Vienna Mark (a weight approximating a pound of fine silver). The following year the new standard was effectively adopted across the German-speaking world when that standard was accepted formally in the Bavarian monetary convention. It is due to the date of the Bavarian Monetary convention that many writers erroneously state that the Maria Theresa Thaler was first struck in 1751. It was named after EmpressMaria Theresa, who ruled Austria, Hungary, and Bohemia from 1740 to 1780. The word thaler gave rise to daalder and daler, which became dollar in English.
Since 1780, the coin has always been dated 1780. On September 19, 1857, Emperor Francis Joseph of Austria declared the Maria Theresa Taler to be an official trade coinage. A little over a year later, on October 31, 1858, the Maria Theresa Taler lost its status as currency in Austria.
In German-speaking countries, following a spelling reform dated 1901 which took effect two years later, "Thaler" is written "Taler" (the spelling of given names like "Theresia" was not affected). Hence 20th-century references to this coin in German and Austrian sources are found under "Maria-Theresien-Taler". The spelling in English-speaking countries was not affected.