Temescher Banat
These acquisitions together with conquests in the Balkans gave Austria its greatest territorial extent to date. 1713 also saw the Pragmatic Sanction, designed to prevent any further division of the territory. But when Charles VI (Archduke 1711–1740) died and was succeeded by his daughter, Maria Theresa (1740–1780) Austria was perceived as weak, leading to the War of the Austrian Succession (1740–1748) and the Seven Years' War (1756–1763). Subsequently, Austria lost Silesia to Prussia. Austria also lost prior conquests from the Ottomans except Banat of Temeswar and Syrmia in the Austro-Russian–Turkish War despite being allied with Russia.