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Why was the Karlskirche commissioned in Vienna?

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The Karlskirche in Vienna was commissioned by Emperor Charles VI to fulfill a religious vow made in 1713.12

The emperor pledged to construct the church as an offering to his patron saint, St. Charles Borromeo, in recognition of the saint's intercession in saving the city from a devastating plague epidemic. Beyond its religious purpose, the building served as a monument to the emperor himself, reflecting his imperial grandeur through a complex architectural design that harmonized elements from significant historical structures, such as the Temple of Jerusalem and the Pantheon. The commission was awarded to the court architect Johann Bernhard Fischer von Erlach, who designed the church to feature symbolic elements, including triumphal columns that honored both the saint and the emperor’s own emblem, the "pillars of Hercules".13