Charles VI (; ; 1 October 1685 – 20 October 1740) was Holy Roman Emperor and ruler of the Austrian Habsburg monarchy from 1711 until his death, succeeding his elder brother, Joseph I. He unsuccessfully claimed the throne of Spain following the death of his relative, Charles II. In 1708, he married Elisabeth Christine of Brunswick-Wolfenbüttel, by whom he had his four children: Leopold Johann (who died in infancy), Maria Theresa (the last direct Habsburg sovereign), Maria Anna (Governess of the Austrian Netherlands), and Maria Amalia (who also died in infancy).
Four years before the birth of Maria Theresa, faced with his lack of male heirs, Charles provided for a male-line succession failure with the Pragmatic Sanction of 1713. The Emperor favoured his own daughters over those of his elder brother and predecessor, Joseph I, in the succession, ignoring the Mutual Pact of Succession he had signed during the reign of his father, Leopold I. Charles sought the other European powers' approval. They demanded significant terms, among which were that Austria close the Ostend Company. In total, Great Britain, France, Saxony-Poland, the Dutch Republic, Spain, Venice, States of the Church, Prussia, Russia, Denmark, Savoy-Sardinia, Bavaria, and the Diet of the Holy Roman Empire recognised the sanction. France, Spain, Saxony-Poland, Bavaria and Prussia later reneged. Charles died in 1740, sparking the War of the Austrian Succession, which plagued his successor, Maria Theresa, for eight years.
Biography
Early years
Archduke Charles (baptized Carolus Franciscus Josephus Wenceslaus Balthasar Johannes Antonius Ignatius), the second son of the Emperor Leopold I and of his third wife, Princess Eleonore Magdalene of Neuburg, was born on 1 October 1685.
Following the death of Charles II of Spain, in 1700, without any direct heir, Charles declared himself King of Spain—both were members of the House of Habsburg. The ensuing War of the Spanish Succession, which pitted France's candidate, Philip, Duke of Anjou, Louis XIV of France's grandson, against Austria's Charles, lasted for almost 14 years. The Kingdom of Portugal, Kingdom of England, Scotland, Ireland and the majority of the Holy Roman Empire endorsed Charles's candidature. Charles III, as he was known, disembarked in his kingdom in 1705, and stayed there for six years, only being able to exercise his rule in Catalonia, until the death of his brother, Joseph I, Holy Roman Emperor; he returned to Vienna to assume the imperial crown. Not wanting to see Austria and Spain in personal union again, the new Kingdom of Great Britain withdrew its support from the Austrian coalition, and the war culminated with the Treaties of Utrecht, Rastatt and Baden three years later. The former, ratified in 1713, recognised Philip as King of Spain; however, the Kingdom of Naples, the Duchy of Milan, the Austrian Netherlands and the Kingdom of Sardinia – all previously possessions of the Spanish—were ceded to Austria. To prevent a union of Spain and France, Philip was forced to renounce his right to succeed his grandfather's throne. Charles was extremely discontented at the loss of Spain, and as a result, he mimicked the staid Spanish Habsburg court ceremonial, adopting the dress of a Spanish monarch, which, according to British historian Edward Crankshaw, consisted of "a black doublet and hose, black shoes and scarlet stockings".
Charles's father and his advisors went about arranging a marriage for him. Their eyes fell upon Elisabeth Christine of Brunswick-Wolfenbüttel, the eldest child of Louis Rudolph, Duke of Brunswick-Wolfenbüttel. She was held to be strikingly beautiful by her contemporaries.
Succession to the Habsburg dominions
When Charles succeeded his brother in 1711, he was the last male Habsburg heir in the direct line. Since Habsburg possessions were subject to Salic law, barring women from inheriting in their own right, his own lack of a male heir meant they would be divided on his death. The Pragmatic Sanction of 19 April 1713 abolished male-only succession in all Habsburg realms and declared their lands indivisible, although the Diet of Hungary only approved it in 1723.
Charles had three daughters, Maria Theresa (1717–1780), Maria Anna (1718–1744) and Maria Amalia (1724–1730) but no surviving sons. When Maria Theresa was born, he disinherited his nieces and the daughters of his elder brother Joseph, Maria Josepha and Maria Amalia. It was this act that undermined the chances of a smooth succession and obliged Charles to spend the rest of his reign seeking to ensure enforcement of the Sanction from other European powers.